$12+5\left(3-2\cdot2\right)-7$
$24x\:-40x$
$\left(\frac{x}{2+y}\right)^2$
$36a^2-9a$
$\frac{\left(2x^2\:+5x-4\right)}{\:\left(x-3\right)}$
$7\left(-3a+8\right)$
$\left(a^2bc-\:2ab^2c+2abc^2\right)\left(3bc+2ac-ab\right)$
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