$\int\frac{3x^2}{49-x^2}dx$
$6-\frac{1}{2}\cdot12$
$\int dk$
$x^2+3-2$
$\left(x^3-3x+2\right)+\left(-2x^2+7x\right)-\left(-x^3-2\right)$
$2x\cdot2-3x-2$
$3m-20\:si\:m=5$
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