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X in (-oo:+oo)
(X-5)/4-1 = (X-13)/5 // - (X-13)/5
(X-5)/4-((X-13)/5)-1 = 0
(X-5)/4+(-1*(X-13))/5-1 = 0
(5*(X-5))/(4*5)+(-1*4*(X-13))/(4*5)+(-1*4*5)/(4*5) = 0
5*(X-5)-1*4*(X-13)-1*4*5 = 0
X-20+27 = 0
X+7 = 0
(X+7)/(4*5) = 0
(X+7)/(4*5) = 0 // * 4*5
X+7 = 0
X+7 = 0 // - 7
X = -7
X = -7
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