$x2\:+\:9=15$
$-500+-700+-1200$
$\int\frac{x+1}{4-x^2}dx$
$\left(2-6\right)^2-\left(8-6\right)^3$
$x^2\left(x^4-2y\right)$
$\left(5x^2-6y^2\right)^2$
$49k^2-7k+4$
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