$\frac { 1 } { 2 } z - 12 = 36$
$\:\left(5x^2-8\right)^2$
$\left(-6x+8\right)^2$
$-x+3y=12$
$-\left(10+8-3\right)+24$
$\left(4x^2+\:x\right)$
$x-18=23\:$
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