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y in (-oo:+oo)
(-2/3)*(y-12)-((1/9)*y) = 0
(-2/3)*(y-12)+(-1/9)*y = 0
-2/3*(y-12)-y/9 = 0
(-2/3*9*(y-12))/9-y/9 = 0
-2/3*9*(y-12)-y = 0
72-7*y = 0
(72-7*y)/9 = 0
(72-7*y)/9 = 0 // * 9
72-7*y = 0
72-7*y = 0 // - 72
-7*y = -72 // : -7
y = -72/(-7)
y = 72/7
y = 72/7
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