$8x+2-7x+4$
$\left(-1\right)^n\left(\frac{2^{n-1}x^n}{n}\right)$
$6.40+6.40+7$
$\left(-5\right)x\left(-5\right)x\left(-5\right)$
$\left(9\cdot10^2\right)\left(2\cdot10^{10}\right)$
$\frac{\sqrt{8x}-10}{2x}$
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