$6x-11y=-8$
$-5\left(-10-2x\right)+10$
$84+4-15-76$
$\lim_{x\to\infty}\left(\frac{x^2+2}{x}\right)$
$\frac{-t}{4}=\frac{-2}{t-7}$
$\int\left(6x\left(3x-1\right)^3\right)dx$
$\int8x^2sen\left(9x+3\right)dx$
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