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x in (-oo:+oo)
(x-9)/4-1 = (x-1)/3 // - (x-1)/3
(x-9)/4-((x-1)/3)-1 = 0
(x-9)/4+(-1*(x-1))/3-1 = 0
(3*(x-9))/(3*4)+(-1*4*(x-1))/(3*4)+(-1*3*4)/(3*4) = 0
3*(x-9)-1*4*(x-1)-1*3*4 = 0
-x-23-12 = 0
-x-35 = 0
(-x-35)/(3*4) = 0
(-x-35)/(3*4) = 0 // * 3*4
-x-35 = 0
-x-35 = 0 // + 35
-x = 35 // * -1
x = -35
x = -35
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