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x in (-oo:+oo)
(x-2)/4 = (x+1)/3 // - (x+1)/3
(x-2)/4-((x+1)/3) = 0
(x-2)/4+(-1*(x+1))/3 = 0
(3*(x-2))/(3*4)+(-1*4*(x+1))/(3*4) = 0
3*(x-2)-1*4*(x+1) = 0
-x-10 = 0
(-x-10)/(3*4) = 0
(-x-10)/(3*4) = 0 // * 3*4
-x-10 = 0
-x-10 = 0 // + 10
-x = 10 // * -1
x = -10
x = -10
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