$\left(8^6\right)\left(8^9\right)$
$x+91=52$
$56w+\left(13x-17x\right)-47w$
$\left(7x^3\right)\left(\frac{1}{7}x^3\right)$
$ab^2-3a^2b$
$\frac{-5a^2x^4}{-3x^2}$
$-8-5\cdot\left(5+3\right)$
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