$2x^2-7x-30=0$
$\left(1+2y\right)dx=\left(4+x\right)dy$
$\int\left(cot\frac{x}{5}\right)dx$
$2a-2a$
$26\:.\:-20$
$2x\left(2x+5y\right)+4\left(2x+5y\right)$
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