$3.77\cdot2.5$
$\frac{1}{4}x=2$
$x^3+y^3=2$
$9x+10-7x=5\left(x+2\right)$
$\frac{1}{1+x},\:x=4$
$-\left(-7n-2\right)-7\left(-2+10n\right)$
$\int_{-2}^2xe^2dx$
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