$\frac{x^3}{3}-\frac{3}{5}^3$
$x-\frac{x+2}{x+7}=\frac{5}{x+7}$
$\left(x^2y^3z^2-2x^3yz^2\right)^2$
$-2x^2+4$
$\left(x+1\right)\sqrt{x^2+1}=y$
$35+\left(9\left(3+\left(2+7\right)\right)\right)$
$7x-12=3x+4$
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