$4b+20=45-b$
$-\:\left[\:b-\left(a-b\right)\right]-\left(-\:\left[\:-\left(b-a\right)\right]\right)$
$-4\left(x-3\right)\left(x+3\right)$
$x+\:\frac{4}{x}=-2$
$2y-8x+6=0$
$n^2-5n+9$
$1\cdot a\cdot\left(-4\right)$
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