$8\:+\:\left(-5\right)\:+\:4\:-\:2\:-\:\left(-3\right)$
$4p\:+\:6q\:=\:20$
$2sen\left(t\right)+cos^2\left(t\right)=2$
$y'-8x^7y=9e^{x^8}$
$16b^2+24b+9$
$\frac{dy}{dx}=\frac{2xy}{y^2+x^2}$
$\left(x-2\right)^3-\left(x+5\right)^3+7-21x^2$
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