$\left(3m+7n\right)^2$
$\left(2x+2\right)$
$3^2\cdot3^{-3}\cdot3^{-6}$
$\left(2y+7x\right)^2$
$-4x^2-6x+4=0$
$\sqrt{\left(2000+4\right)\left(2000+2\right)+1}$
$\frac{5}{8}c+13=18$
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