$\frac{-18x^2-11+4x+8x^4}{-2x^2+5}$
$\frac{6-y}{2}=\frac{14-3y}{4}$
$\left(n-5\right)\left(n^2-4\right)$
$5xy+15x^2-30x^3y^3$
$sen\left(y\right)\:-\:2y\:sen\left(x\right)dx\:+\:cos\left(y\right)\:+\:2\:cos\left(x\right)dy=0$
$\log_b\left(x\right)+\log_b\left(x-5\right)=\log_b\left(14\right)$
$x^4-xy^3-xy^3+y^4$
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