$7b-9b+6a-4b-ab$
$\int tan^3\left(x\right)sec^5\left(x\right)dx$
$\frac{dy}{dx}=7x-5xy$
$2x^2+9x-350$
$\sqrt{1-\frac{\sin\left(a\right)\cos\left(a\right)}{\tan\left(a\right)}}$
$-a+4a$
$2\left(x+3\right)=x+6$
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