$\frac{4x-8}{x-2}\ge0$
$45a^2-52ab+3ab-90a^2+47ab+8$
$\left\{14+8\right\}-\left\{10+5\right\}+\:\left\{23+13\right\}$
$\left(2x+1\right)^2-\left(2x-1\right)^2-8y$
$m+\left(m-3\right)$
$x^2+4x=-2$
$6t\:-\:t\:-\:11t\:-\:19t$
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