$\left(80\right)+\left(-70\right)-\left(-20\right)-\left(+100\right)$
$\left(7m^2+8n^3\right)^2$
$\left(4-2x\right)^2$
$m+2\:m-1+4m$
$3\left(h+x\right)^3$
$a+\frac{1}{2}a+\frac{2}{3}a$
$81x^2-100$
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