$5\log x+6\log\left(x+7\right)$
$\frac{z+78}{2}=22$
$b^2-3b-18$
$\left(10x^3-9xy2\right)$
$\left(x+2\right)^2-2\left(x-2\right)-6;\:x=-3$
$\frac{dy}{dx}=\left(4-y\right)\left(4-2y\right)^2$
$x-\frac{x^3}{4}+\frac{x^5}{9}-\frac{x^7}{16}$
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