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y in (-oo:+oo)
(1/2)*y+(2/3)*y-7 = 12 // - 12
(1/2)*y+(2/3)*y-12-7 = 0
7/6*y-19 = 0 // + 19
7/6*y = 19 // : 7/6
y = 19/7/6
y = 114/7
y = 114/7
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