$-7c^2b+c^2b+3cb^2$
$\frac{d}{dz}4x^3+4xy+7y^3$
$\frac{x^3-2x^2+7x-2}{x^2+1}$
$\left(5xy-2\right)^2$
$5x^3-10x=0$
$x^2-11x+121$
$\left(5x^2y^4+3y\right)dx\left(6x^33y^3+3x\right)dy=0$
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