$x+91=52$
$\left(x+4\right)^2y''+2\left(x+4\right)y'-2y$
$\frac{dx}{dz}=x\left(1-x\right)$
$4\sin\left(x\right)+3=1-\sin\left(x\right)$
$2\:0+1+7$
$-1\left(-6\right)\left(5\right)$
$\lim_{x\to0}\left(\frac{\sqrt{1+4x}-\sqrt{1-10x}}{x}\right)$
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