$-453\:\cdot\:0$
$\left(x^3+5x^2-2x+1\right)\::\:\left(x-3\right)$
$\left(3x-9\right)\left(2x+3\right)$
$\frac{1}{\left(x+\right)}+\frac{1}{\left(x+1\right)}$
$121\left(2x-3\right)^2-99\left(5-y\right)^2$
$y^3\left(1+cos2x\right)=c$
$-2\cdot\left(-5+\left(5-1\right)\right)\cdot\left(-3\right)$
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