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y in (-oo:+oo)
(2*y)/12-(10/12) = (4*y)/12-(2/12) // - (4*y)/12-(2/12)
(2*y)/12-((4*y)/12)-(10/12)+2/12 = 0
(2*y)/12+(-1/3)*y-5/6+2/12 = 0
-1/6*y-2/3 = 0 // + 2/3
-1/6*y = 2/3 // : -1/6
y = 2/3/(-1/6)
y = -4
y = -4
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