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(x-3)/4-1 = (x-9)/5 // - (x-9)/5
(x-3)/4-((x-9)/5)-1 = 0
(x-3)/4+(-1*(x-9))/5-1 = 0
(5*(x-3))/(4*5)+(-1*4*(x-9))/(4*5)+(-1*4*5)/(4*5) = 0
5*(x-3)-1*4*(x-9)-1*4*5 = 0
x-20+21 = 0
x+1 = 0
(x+1)/(4*5) = 0
(x+1)/(4*5) = 0 // * 4*5
x+1 = 0
x+1 = 0 // - 1
x = -1
x = -1
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