$-100-200-900+1200+400$
$3x+5\left(x+1\right)$
$\int\frac{x+1}{x^2\left(x-1\right)}dx$
$\lim_{n\to\infty}\frac{5^{n+1}+7^{n+2}}{5^n+7^{n+1}}$
$x^2-5x+10=0$
$\left(2n-4\right)^2$
$\left(a+b\right)^2-c\:entre\:a+b+c$
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