$\left(x^4-2x^3+3x-4\right)+\left(2x^3+5x^2-4x+2\right)$
$-42\:x\:-6$
$-\left(-4\:+\:5\:-\:6\right)\:-\:\left(+7\:-\:3\:+\:6\right)\:-\:5$
$11+4r\:when\:r\:=5$
$\:\frac{2}{3}mn^2-2mn+10mn^2-\frac{1}{3}mn+2mn^2$
$\left(\frac{1}{4}x^2-\frac{4}{2}y\right)$
$9x^8+30x^4+25$
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