$-\left(+7\right)-\left(-5\right)-\left(+2\right)-\left(+9\right)+\left(-15\right)$
$2y^3-5y^2+7;\:y=-2$
$\left(1-x^{-1}\right)^2\cdot\left(1-2x^{-1}\right)$
$6x^2y-3y^2$
$\left(3-x^4\right)^3$
$\frac{\left(3x-1\right)^k}{k^2-k}$
$\left(-8x+8\right)^2$
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