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y in (-oo:+oo)
(1/4)*y+(1/6)*y = -3 // + 3
(1/4)*y+(1/6)*y+3 = 0
5/12*y+3 = 0 // - 3
5/12*y = -3 // : 5/12
y = -3/5/12
y = -36/5
y = -36/5
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