$-4-\left(2.8\right)$
$-\:2g\:-\:\left(g\right)\:$
$x^2+2x=55$
$\left(x\:+\:3y\right)\left(x\:-\:3y\right)$
$-38.75+122$
$\frac{4}{s^2+2s+1}$
$\left(\frac{1}{2}x^2-8\right)^2$
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