$7.9-11.6$
$2\left(2-7\right)+3\left(1-5\right)+8$
$\frac{1}{2}860\cdot13.92^2$
$4a^4-12a^2+9$
$3x\:x\:e^{-x}$
$\frac{1+a}{2+a}=\frac{1}{2}$
$y=\frac{2x+4}{1-x}$
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