$4-\left(-5\right)$
$\frac{1}{x-2}-\frac{5}{x+4}=\frac{6}{x^2+2x-8}$
$81x^2+10x-9$
$y'+8x=e^{7x}$
$1-2+3+4+5-6+7-8$
$9y^2=4x^3$
$3x+1\le7$
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