The phrase "an important solution to" is correct and usable in written English.
You can use it when discussing a significant answer or remedy to a problem or challenge.
Example: "The researchers presented an important solution to the issue of climate change during the conference."
Alternatives: "a crucial answer to" or "a key remedy for".
Strong health systems are an important solution to broader global issues of poverty and inequity.
The ISL will become an important solution to reduce the shortage of ground TT&C resources.
In China as a whole, the volume of municipal solid waste is growing at about 8 to 10 percent a year, and Beijing increasingly sees incinerators as an important solution to China's waste woes.
Spain is among the countries in southern Europe to have been hardest hit by the austerity policies that northern nations like Finland, Germany and the Netherlands have insisted on as an important solution to the euro crisis.
Since lighting accounts for 20% of global electricity consumption in buildings, daylighting system is an important solution to achieve energy savings in lighting and to reduce carbon dioxide emissions.
Housing stem cells inside a hydrogel coating, directly deposited around them individually and in groups, may be an important solution to the problem of increasing stem cell viability and protection in cultivation.
The improvement and expansion of public transport is an increasingly important solution to the high congestion costs and worsening environmental impacts of the car dominated transport systems seen in many cities today.
Television, and other mediums of art, pose a very important solution to this problem.
The history of mHealth, framed as a potentially important solution to pre-existing problems, so far only covers 5 years.
Brown's new funding plan would offer a short-term but important solution to the bullet train's financial problems but leaves many crucial, longer-term issues murky.
