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Y in (-oo:+oo)
(1/2)*(Y-3)+(2*Y)/3 = (Y+1)/4 // - (Y+1)/4
(1/2)*(Y-3)-((Y+1)/4)+(2*Y)/3 = 0
1/2*(Y-3)+(-1*(Y+1))/4+(2*Y)/3 = 0
(1/2*3*4*(Y-3))/(3*4)+(-1*3*(Y+1))/(3*4)+(2*4*Y)/(3*4) = 0
1/2*3*4*(Y-3)-1*3*(Y+1)+2*4*Y = 0
3*Y+8*Y-21 = 0
11*Y-21 = 0
(11*Y-21)/(3*4) = 0
(11*Y-21)/(3*4) = 0 // * 3*4
11*Y-21 = 0
11*Y-21 = 0 // + 21
11*Y = 21 // : 11
Y = 21/11
Y = 21/11
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