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x in (-oo:+oo)
(1/5)*(x-9) = 5*x-(4*(x-1))+39/5 // - 5*x-(4*(x-1))+39/5
(1/5)*(x-9)+4*(x-1)-(5*x)-(39/5) = 0
(1/5)*(x-9)+4*(x-1)-5*x-39/5 = 0
1/5*(x-9)+4*(x-1)-5*x-39/5 = 0
(1/5*5*(x-9))/5+(4*5*(x-1))/5+(-5*5*x)/5-39/5 = 0
1/5*5*(x-9)+4*5*(x-1)-5*5*x-39 = 0
21*x-25*x-39-29 = 0
-4*x-39-29 = 0
-4*x-68 = 0
(-4*x-68)/5 = 0
(-4*x-68)/5 = 0 // * 5
-4*x-68 = 0
-4*x-68 = 0 // + 68
-4*x = 68 // : -4
x = 68/(-4)
x = -17
x = -17
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