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"good at math" is a perfectly correct and usable phrase in written English.
For example: "My sister is really good at math; she's already done advanced calculus in high school."
Exact(60)
"I'm not good at math".
I was good at math.
"Never was any good at math.
It helps to be good at math.
I was good at math and physics.
"I was so good at math".
"I never was good at math".
"I'm not really good at math," she said.
I asked him if he was good at math.
And from then on, I wasn't good at math anymore.
Chances are, your sound system isn't very good at math.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com