$12a-5ab+a-7a+3ab$
$2x-1=4x+7$
$\left(f^5+2f^3\right)^3$
$5x^2\cdot4x-5x^2\cdot3x^3+5x^2\cdot x^7-5x^2\cdot6x^2$
$6xy^2\left(13x^5y^2\right)$
$20+90+513$
$\frac{1}{2}a+4\left(b-2\right)-c$
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