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x in (-oo:+oo)
(x+3)/3-((x-1)/2) = 4 // - 4
(x+3)/3-((x-1)/2)-4 = 0
(x+3)/3+(-1*(x-1))/2-4 = 0
(2*(x+3))/(2*3)+(-1*3*(x-1))/(2*3)+(-4*2*3)/(2*3) = 0
2*(x+3)-1*3*(x-1)-4*2*3 = 0
9-x-24 = 0
-x-15 = 0
(-x-15)/(2*3) = 0
(-x-15)/(2*3) = 0 // * 2*3
-x-15 = 0
-x-15 = 0 // + 15
-x = 15 // * -1
x = -15
x = -15
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