$-5.8c+4.2-3.1+1.4c$
$4\left(9f+1\right)+2$
$\left(20x^2-2\right)^2$
$\lim_{x\to0}\left(\frac{1-\cos^2\left(x\right)}{\sin^2\left(x\right)}\right)$
$a^2-3a=0$
$3x+5x+\left(7x-3x-x\right)$
$x^2+11x-18$
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