$3x^2y^3-2x^4y^2-5xy$
$3\:\left(3m^3\right)\left(-2b\right)^3$
$5.5r+3.5r$
$\lim_{x\to0}\left(\frac{\cos\left(x\right)-1}{2x^3\csc\left(x\right)}\right)$
$\lim_{x\to3}\frac{x^4-81}{x+3}$
$37+15c+31+16+12$
$x+2x-7x+18x-4$
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