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y in (-oo:+oo)
(1/2)*(y-3)+(2/3)*y = y+1/4 // - y+1/4
(1/2)*(y-3)+(2/3)*y-y-(1/4) = 0
(1/2)*(y-3)+(2/3)*y-y-1/4 = 0
1/2*(y-3)+(2*y)/3-y-1/4 = 0
(1/2*3*4*(y-3))/(3*4)+(2*4*y)/(3*4)+(3*4*(-y))/(3*4)+(-1*3)/(3*4) = 0
1/2*3*4*(y-3)+2*4*y+3*4*(-y)-1*3 = 0
14*y-12*y-18-3 = 0
2*y-18-3 = 0
2*y-21 = 0
(2*y-21)/(3*4) = 0
(2*y-21)/(3*4) = 0 // * 3*4
2*y-21 = 0
2*y-21 = 0 // + 21
2*y = 21 // : 2
y = 21/2
y = 21/2
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