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x in (-oo:+oo)
a/b = b*(x/5) // - b*(x/5)
a/b-(b*(x/5)) = 0
a*b^-1-1/5*b*x = 0 // - a*b^-1
-1/5*b*x = -(a*b^-1) // : -1/5*b
x = (-(a*b^-1))/(-1/5*b)
x = -5*a*b^-2
x = -5*a*b^-2
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