$2x-1=x+6$
$5x^2y-8xy^2-9y^3;\:x=2;\:y=-1$
$\frac{dy}{dx}=-6xy\:,\:y\left(0\right)=-4$
$\left(-8x^3y^2z^5\right).\left(7x^2y^4z\right)$
$\left(5+x\right)\left(7-x\right)$
$\left(4x+13y\right)^2$
$3a+21$
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