$\left|3+4-\left(-7\right)\right|-\left|\left(5+4\right)-\left(-5\right)\right|$
$20f-60f+45$
$-\left(2+6-9\right)$
$12z+2$
$w=x^2+y^2$
$\left(p\:+\:2b\right)^2$
$36x^6-108x^3x+81^2$
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