$-\left(-5+4\right)+\left(-7+12\right)$
$8ab-3ab-7ab+4ab-9ab$
$15a^5b+30a^4b^2-45a^3b^3$
$\left(x-y\right)^2\left(x-y\right)^2$
$\left(5x^2+a^2\right)\left(5x^2-a^2\right)$
$\frac{1}{2}w-12=18$
$\frac{x}{y}=2,4$
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