$+14\cdot\left(-7\right)\cdot5$
$2x^2+2\left(3x-2y^3\right);\:x=2;\:y=-1$
$5x+2y^2+11+3y^2+4x+2xy+1$
$a^6-12ab+36^2$
$\frac{z^{-4}}{z^2}$
$8\left(2x-5\right)-6\left(3x+10\right)$
$\int\frac{x^2-x+2}{\left(x+4\right)\left(x-4\right)}dx$
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