$\left(8a^2-5b\right)^3$
$-3\left(-7\:-\:6b\right)$
$-2sin^2x=sinx-1$
$x-19=-33$
$-\frac{1}{2}x-\frac{3}{4}y=-2$
$\left(x-13\right)\left(x-20\right)$
$4x^2+12x+2$
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