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y in (-oo:+oo)
1-((2/6)*y) = (3/12)*y // - (3/12)*y
1-((2/6)*y)-((3/12)*y) = 0
(-1/3)*y+(-1/4)*y+1 = 0
1-7/12*y = 0 // - 1
-7/12*y = -1 // : -7/12
y = -1/(-7/12)
y = 12/7
y = 12/7
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