$-18a+15a$
$y=\left(2x-1\right)\left(3x+2\right)$
$\lim_{t\to0}\left(\frac{3cos\left(t\right)+\frac{3t^2}{2}-3}{4t^2}\right)$
$\frac{dx}{dt}=\frac{3}{4}-\frac{3x}{100}$
$40b^2m+30b^2-20bm$
$\lim_{x\to0}\left(\frac{51senx-3sen\left(17x\right)}{x\left(cosx-cos\left(17x\right)\right)}\right)$
$3x^4-65x^3$
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