$3x^2+3x-3x$
$2x=-26$
$2\sin^2x-\sin x-1$
$90x^2-80\cdot100$
$\int\frac{10}{\left(x+1\right)^2}dx$
$\frac{2}{2x}$
$\frac{dy}{dx}=2y-x^3$
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