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y in (-oo:+oo)
(2/3)*(y-12) = 6 // - 6
(2/3)*(y-12)-6 = 0
2/3*(y-12)-6 = 0
2/3*(y-12)-6 = 0
2/3*y-14 = 0
2/3*y-14 = 0
2/3*y-14 = 0 // + 14
2/3*y = 14 // : 2/3
y = 14/2/3
y = 21
y = 21
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