$\frac{14x+7}{x^2+x-6}$
$100x^2-81x^2y^4$
$-20+5f=90$
$\left(5x^{2}-21\left(5x^{2}+2\right)$
$3m-4n\:+7,\:para\:m=3\:n=2$
$\int\left(x^5-+2x^3+1\right)^4\cdot\left(5x^4-6x^2\right)$
$2x^2+x^2+4x+2$
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