$-x^2-12x^2-3x^2+15x^2$
$\frac{8x^2+2x-5}{x+2}$
$3n-12n^2-27$
$x+6=8+3x$
$\left(x^2+xy+y^2\right)\cdot4x-\left(x^4-y^4\right)\cdot\left(\:2x+y\right)$
$\lim_{x\to0}\:e^x-sen\:2x-1$
$\int\frac{11x^2+13x+6}{x^2\left(3x+2\right)}dx$
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