$-6mn+2mn$
$x^2-2=9x$
$x^3-2x^2+10x=0$
$6=2x^2-4x+2$
$\frac{7}{2}mn\frac{2}{13}$
$2ax^4+3bx^4+10a+15b$
$\frac{b}{\sqrt{b}-b}$
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