$\left(7\right)^2\cdot7\cdot\left(7\right)^2$
$\sqrt{8x^3}$
$5x-50=x+30$
$27x^2+18x+3$
$-2.7+\left(-0.7\right)+\left(-4.2\right)$
$\left(y^2z^9\right)^4$
$2^3+2^4$
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