$-7-\frac{5}{6}x=18$
$36x^2-48xy+16y^2$
$2a-5a^2$
$1.4\cdot1.2$
$\left(a+1\right)\left(a-1\right)\left(a^2+1\right)$
$\frac{x^2-2x-3}{x-3}$
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