$2+7-6+8$
$x+5=20+2x$
$\left(4x^5+y^4\:\right)^2$
$\left(4x^2-3x\right)\left(-x+4\right)$
$\frac{3a^{7}}{a^{7}}$
$2\left(-1\right)^3-10\left(-1\right)^2+2\left(-1\right)-10$
$085mxy-\frac{1}{2}mxy$
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