$\frac{dy}{dx}=2-7x$
$\left(+6\right)\cdot\left(-3\right)\cdot\left(-2\right)$
$2a^5b^2c+4a^3b^5z-8a^3b^2d$
$\cot\left(x\right)^2=7$
$\left(4a^2+5\right).\left(4a^2-2\right)$
$\left(6x+7\right)\left(7x-1\right)$
$-15x-12=18$
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