$\left(4x+2y+z\right)-\left(-3x+4y-2z\right)$
$2-3-5$
$x^2+1x+2$
$4y^2+4y$
$\left(3x+4y\right)\left(3x-2y\right)$
$\frac{3x^2+7x-1}{x+3}$
$7x^4y^2+3x^4y-5^2y^2$
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