$3\left(a+b\right)+15x\left(a+b\right)-21xy\left(a+b\right)$
$12x^2-31<2$
$\:x\:+\:420\:>\:612$
$\left(5x^3-7y^2\right)^3$
$\frac{3}{x}=\frac{x}{27}$
$\frac{cosx}{sinx}sec^2x$
$2\sqrt{4}^2$
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