$x\left(4\right)-12\cdot x\left(2\right)+x-1$
$a^2-4b\:=\:1$
$36-224$
$\frac{dy}{dx}=\left(\frac{1}{2}\right)-x+2y$
$324\cdot7$
$+\left(+15\right)-\left(-13\right)-1$
$\int_1^{\infty}\left(\frac{1}{x^2+2x}\right)dx$
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