$\left(72\right)-\left(-70\right)-\left(-20\right)$
$10x^4-15x^3+10x^2$
$\:\left(-2\right)\:-\:\left[-6\:+\:\left(-4\:-\:2\right)\right]\:+\:\left[-\:\left(-3\right)\right]$
$-\int\left(x^{-2}\right)dx$
$24x^2+18x^3y^2-6x^2y^2$
$3x^2+x=x^2-4x+3$
$-30r+15$
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