$-1+12+-3$
$\:f\left(x\right)=x^3+6x^2-15x$
$\left(4x-7\right)\cdot\left(4x+7\right)$
$\left(5a^2+2b^5\right)^3$
$\left(-2\right)^2-\left(-2\right)+1\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:$
$x+1=2x+6$
$2x'+3x-2y=0$
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