$-4\left(x\:+\:1\right)\:+\:5x$
$\sqrt{\frac{50}{2}}$
$\frac{x}{x+3}=\frac{y}{5x+15}$
$\frac{\left(\left(4xy^2\right)^3\right)^2}{\left(8xy\right)\left(^2\right)}$
$\frac{2x\cdot\:\left(x-2\right)-x^2}{\left(x-2\right)^2}$
$3+sec^2x$
$\left(2x^2-3x-2\right)+2\left(x-3\right)$
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