$m^2+71mn+14m^2-65mn+m^3-m^2-115m^2+6m^3$
$3x+y-1;\:x=2;\:y=-1$
$\left(\frac{1}{2}x^2y-2\right)^3$
$-12+9+-9+-5+3+5+-12$
$5x\:-2=2x+13$
$-2m^5+250m^2$
$\:\frac{dr}{dt}=\:2\:sen\:t\:-e^{-t}\:;\:r\left(0\right)=4$
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