$\left(-4\right)-\left(-5\right)+\left(-6\right)-\left(-1\right)+\left(-5\right)$
$\left(x^2-\:12\right)\:\left(\:x^2\:+\:8\right)\:$
$\frac{dy}{dz}=\frac{1}{zy+z+y+1}$
$\left(x^{n+1}\right)\left(x^2\right)$
$-5xy+10x-7xy-11x$
$-2bc^3+6bc^3-8bc^3+4bc^3$
$1x^2-x-2$
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