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(x-1)/2 = (x-4)/5 // - (x-4)/5
(x-1)/2-((x-4)/5) = 0
(x-1)/2+(-1*(x-4))/5 = 0
(5*(x-1))/(2*5)+(-1*2*(x-4))/(2*5) = 0
5*(x-1)-1*2*(x-4) = 0
3*x+3 = 0
(3*x+3)/(2*5) = 0
(3*x+3)/(2*5) = 0 // * 2*5
3*x+3 = 0
3*x+3 = 0 // - 3
3*x = -3 // : 3
x = -3/3
x = -1
x = -1
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