$x^2+7=0$
$\frac{x^3-2}{x+1}$
$\left(21h+15n\right)^2$
$f\left(x\right)=6x+2$
$4\left(2x\right)^3$
$6^{3}:[\left(2^{7}:2^{6}\right)\cdot3]^{2}$
$2xy^'+4y=10x^3$
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