$0=\frac{x+3}{7x-28}-\frac{6}{x-4}-\frac{2}{7}$
$x+86=47$
$\frac{\left(-10x^2y^3+5x^2y^4+x^3y^3z\right)}{2xy^2}$
$xy'\:+\:y^2\:=\:y^3$
$\frac{1}{\left(-13\right)^{0}}$
$1-20x^2+100x^4$
$-231+79+51$
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