Simplifying
$\frac{2-3x+4}{2-x}$
$=16x^2-64$
$76:\left(-2\right)$
$\:9x-8y-5y$
$7+ab-b+b-2ab$
$a\left(x\right)\:=\:\left(x+4\right)\left(x-2\right)$
$+0.5-0.75$
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