$21x^2y^2+28x^2y-7xy$
$5x^2-15x^2+25x^2$
$-2\cdot\left(2\right)-\left(-4\right)\cdot\left(5\right)$
$81,92+67,13+50,38$
$\frac{n^3\left(n^4\right)^2}{2mn}$
$s^2+5s+8$
$-3x^2\left(2x^3-x^2-5\right)$
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