$5x-55x-7$
$6d+3d-2$
$\left(5x-2y+3\right)\cdot\left(2x+3y-4\right)$
$\int\frac{9x+25}{\left(x+3\right)^2}dx$
$f\left(x\right)=5+2$
$1-2cos2x+cos3xsinx-sin2x+cosxsin3x=0$
$\frac{1}{\left(4+x\right)^2}$
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