$-2a\:+4$
$\left(\frac{5}{6}x^2y^3z^2-x^4y^2z^4\right)^2$
$w^6-y^6$
$\frac{2}{x+2}-\frac{3}{2x-5}$
$7x+3=4x+15$
$\left(+4-19\right)-13$
$x^2-24x+144=0$
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