$\left(2b+4\right)\left(2b-7\right)$
$\left(m^4n^3\right)^7\left(m^4\right)^3$
$\frac{1}{2}x-2x+8$
$\lim_{x\to0}\:\frac{1-tanx}{1-senx}$
$cy+2x=3$
$\left(3x\left(-3\right)+10:2\right)+8:2-\left(-1\right)$
$\frac{9}{16}n^2-\frac{3}{2}n+1$
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