$25+\frac{7\left(12-2^2\right)}{4}$
$\left(7+2y\right)^2$
$2m-13=-8m+27$
$z^2-17+30$
$5x^3y\:-\:2x^3y$
$6x^3+12x+16.$
$\left(5a^2b^2\right)^3$
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