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y in (-oo:+oo)
(2/3)*y-y-(1/4) = (1/12)*(y+4) // - (1/12)*(y+4)
(2/3)*y-((1/12)*(y+4))-y-(1/4) = 0
(-1/12)*(y+4)+(2/3)*y-y-1/4 = 0
(2*y)/3-1/12*(y+4)-y-1/4 = 0
(-1/12*3*4*(y+4))/(3*4)+(2*4*y)/(3*4)+(3*4*(-y))/(3*4)+(-1*3)/(3*4) = 0
2*4*y-1/12*3*4*(y+4)+3*4*(-y)-1*3 = 0
7*y-12*y-4-3 = 0
-5*y-4-3 = 0
-5*y-7 = 0
(-5*y-7)/(3*4) = 0
(-5*y-7)/(3*4) = 0 // * 3*4
-5*y-7 = 0
-5*y-7 = 0 // + 7
-5*y = 7 // : -5
y = 7/(-5)
y = -7/5
y = -7/5
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