$\frac{\sqrt{5\left(1\right)-\left(-4\right)}}{3}$
$\frac{x^2}{3\:-\:x}$
$x+2\left(x-1\right)$
$\left(-78\right)+\left(126\right)-\left(+230\right)$
$15x^2-31x+10$
$-6\left(4\:-\:1\right)\:-\:12$
$x^4-6x^2+2$
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