$-\frac{15}{2}c+\frac{14}{3}c-2a+11a-12-3k$
$3+3^2\cdot3-3+3$
$-39+-16-48$
$-11y^4+20y^4$
$y'+xy=xy^{-2}$
$\lim_{x\to3}\left(\frac{\left(tan4x\right)-4x}{x^3}\right)$
$b^2+4b-45$
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