$2^7\cdot2^1$
$\frac{1}{2}\left(4x+8\right)=2x+8$
$\left(y-9\right)dx+x^2dy=0$
$\lim_{x\to7}\:\left(2x+3\right)$
$20+\left(-15\right)+8-\left(-9\right)$
$b^3+\:3b$
$10\left(y+2\right)=20$
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