$3x+7=x+3$
$7x^2-2x$
$\left(2x+5\right)\left(x^2-4x-1\right)$
$18x^3+63x^2+27x$
$\frac{3}{x-2}-\frac{4}{x+1}$
$2\left(5-d\right)=2-4d$
$-10x+-5x+3z$
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