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x in (-oo:+oo)
(x-1)/4-3 = (x-7)/3 // - (x-7)/3
(x-1)/4-((x-7)/3)-3 = 0
(x-1)/4+(-1*(x-7))/3-3 = 0
(3*(x-1))/(3*4)+(-1*4*(x-7))/(3*4)+(-3*3*4)/(3*4) = 0
3*(x-1)-1*4*(x-7)-3*3*4 = 0
25-x-36 = 0
-x-11 = 0
(-x-11)/(3*4) = 0
(-x-11)/(3*4) = 0 // * 3*4
-x-11 = 0
-x-11 = 0 // + 11
-x = 11 // * -1
x = -11
x = -11
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