$3x^2+7x-20=0$
$2x+3=281$
$10s-4\left(t+6s\right)-3t$
$+36-1+4-32+16$
$6a+18ab$
$\int\cos^25dx$
$1+\left(x+1\right)\cdot\left(x-1\right)$
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