$6b+7b-14$
$\left(-4x-2x^2\right)^5$
$4\left(x-4\right)$
$\frac{x}{64}=-71$
$x^4-6x^5$
$\left(2+7x\right)\left(2+6x\right)$
$\frac { 42 y ^ { 9 } y ^ { 2 } } { 7 x ^ { 5 } y ^ { 2 } }$
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