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y in (-oo:+oo)
(2/3)*y+12*(1/2) = 1 // - 1
(2/3)*y+12*(1/2)-1 = 0
2/3*y+5 = 0 // - 5
2/3*y = -5 // : 2/3
y = -5/2/3
y = -15/2
y = -15/2
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