$\left(15-4\right)+3-\left(12-5+2\right)-9$
$x2-4x-12\:x\:x-3$
$\left(3x-2\right)\left(3x+4\right)$
$x-\frac{9}{5}-x-\frac{4}{15}\le1-\frac{2x}{3}$
$2\:x+2-12$
$\left(4+y\right)^3$
$-43+67-27+4-7+8+5-5-16+82$
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