$-2x+3y=20$
$\left|-2x-\left(-3y\right)\right|\left|-3y+\left(-2x\right)\right|$
$4\cos^2b\:-\:2\sin^2b\:+\:2$
$4x+5y-4+6x-3y-1$
$24wz+8uw=8w$
$\frac{\sin\left(-\pi\right)^2}{\sec\left(-\pi\right)^2-1}$
$\left(2m^2\right)\left(5n^6\right)$
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