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y in (-oo:+oo)
(y-1)/3-((y-2)/4) = 1 // - 1
(y-1)/3-((y-2)/4)-1 = 0
(y-1)/3+(-1*(y-2))/4-1 = 0
(4*(y-1))/(3*4)+(-1*3*(y-2))/(3*4)+(-1*3*4)/(3*4) = 0
4*(y-1)-1*3*(y-2)-1*3*4 = 0
y-12+2 = 0
y-10 = 0
(y-10)/(3*4) = 0
(y-10)/(3*4) = 0 // * 3*4
y-10 = 0
y-10 = 0 // + 10
y = 10
y = 10
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