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y in (-oo:+oo)
(1/3)*y-((1/4)*(y-1)) = 6*y // - 6*y
(1/3)*y-((1/4)*(y-1))-(6*y) = 0
(-1/4)*(y-1)+(1/3)*y-6*y = 0
y/3-1/4*(y-1)-6*y = 0
(-1/4*3*(y-1))/3+y/3+(-6*3*y)/3 = 0
y-1/4*3*(y-1)-6*3*y = 0
1/4*y-18*y+3/4 = 0
3/4-71/4*y = 0
(3/4-71/4*y)/3 = 0
(3/4-71/4*y)/3 = 0 // * 3
3/4-71/4*y = 0
3/4-71/4*y = 0 // - 3/4
-71/4*y = -3/4 // : -71/4
y = -3/4/(-71/4)
y = 3/71
y = 3/71
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