$\frac{-3+8}{-4}>11\cdot4$
$x^2+3x^2+2x+1\:.\:4$
$\frac{10b}{-30ab}$
$\frac{8}{3}\cdot\frac{3}{8}$
$2y-2yx-3y^2=0$
$\left(21\right)\left(18\right)$
$-4k-8+4k$
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