$x\left(a-b\:\right)$
$\frac{z}{3}-6=2$
$x^26x-1$
$\left(9\right)^2$
$-2\cdot1^2-4\cdot1+6$
$15-\left(-32\right)$
$-3x^2+\left(-2\right)^4-4^3+\left(-2\right)^4$
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