$2x\le7x-35-5a$
$\left(a+7\right)\left(2a-3\right)$
$\int\left(\frac{6x}{\left(3x^2+1\right)^2}\right)dx$
$-5u-6u$
$\int\frac{2x-1}{\left(x+2\right)\left(x-4\right)\left(x+3\right)}dx$
$\left(3z+4\right)^2$
$\frac{sin\left(2x\right)}{1+sin^2\left(x\right)}$
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