$5\left(-2+7\right)-4$
$x^2+2x+4=7$
$5.4\cdot100$
$y=\frac{\left(x-1\right)}{\left(x^2-5x+6\right)}dx$
$x^2+14x+49=0$
$\int_0^3\left(x^2e^{-7x}\right)dx$
$\:\left(\frac{4}{3}x^2y^3\right)^3$
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