$\left(x+2y+4\right)\left(x+2y-4\right)$
$2x-y\cdot y+2x$
$2y\\:-\\:6x\\:+\\:8\\:-\\:4x\\:$
$\pm\sqrt{\frac{48}{3}}$
$32 + x = - 83$
$\left(2x+3\right)\left(a-b\right)-\left(x-1\right)\left(a-b\right)$
$\frac{dy}{dx}=x^2y^3+xy^3$
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