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(1/5)*(x-4) = 5*x-(4*(x-1))+12/5 // - 5*x-(4*(x-1))+12/5
(1/5)*(x-4)+4*(x-1)-(5*x)-(12/5) = 0
(1/5)*(x-4)+4*(x-1)-5*x-12/5 = 0
1/5*(x-4)+4*(x-1)-5*x-12/5 = 0
(1/5*5*(x-4))/5+(4*5*(x-1))/5+(-5*5*x)/5-12/5 = 0
1/5*5*(x-4)+4*5*(x-1)-5*5*x-12 = 0
21*x-25*x-24-12 = 0
-4*x-24-12 = 0
-4*x-36 = 0
(-4*x-36)/5 = 0
(-4*x-36)/5 = 0 // * 5
-4*x-36 = 0
-4*x-36 = 0 // + 36
-4*x = 36 // : -4
x = 36/(-4)
x = -9
x = -9
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