$4x-7=2x-7$
$-25mn+30mn$
$3-\left(-4\right)+5-\left|2-\left(4-\left(-7\right)+10\right)\right|$
$5+17a-9b+20-b-a$
$a^{-1}b^3\:x\:4b$
$20\left(5\right)^2+\frac{100}{5}$
$\left(\frac{1}{2}x-2\right)\left(\frac{1}{2}x+2\right)$
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