$\frac{x^3+2x-3}{x+4}$
$4xy\:-\:4xz\:+\:7xy\:-\:11yz\:$
$24x^2y^5+60x^2y^2-36x^4y^3$
$x^2-3xy-5xy+4x^2+8y^2$
$\left(a+b+4\right)^2$
$r+r+4$
$y=\frac{5x}{ln\left(2x\right)}$
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