$-\frac{1}{2}\left(-2\right)^2\:+\:8$
$x^2-2xy^3=x-3$
$5\:5x+6\:6x$
$8\left(-4j+1\right)+6j$
$\frac{10x^5}{2x}$
$6n-20=3n+7$
$\left(7a-3x^2\right)\left(7a+3x^2\right)$
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