$1+7+16+-18$
$\frac{x}{a}-\frac{x}{b}=\frac{1}{a+b}$
$3x+2>x+12$
$\left(4x^2+7\right)^2$
$\left(4m^2+6n^4\right)$
$6x\left(x+8y\right)\frac{dy}{dx}=6y\left(x-8y\right)$
$9x^2+30x\:=\:-41$
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