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y in (-oo:+oo)
(1/6)*y+(1/4)*y = -4 // + 4
(1/6)*y+(1/4)*y+4 = 0
5/12*y+4 = 0 // - 4
5/12*y = -4 // : 5/12
y = -4/5/12
y = -48/5
y = -48/5
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