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y in (-oo:+oo)
(-2/3)*(y-15)-((1/6)*y) = 0
(-2/3)*(y-15)+(-1/6)*y = 0
-2/3*(y-15)-y/6 = 0
(-2/3*6*(y-15))/6-y/6 = 0
-2/3*6*(y-15)-y = 0
60-5*y = 0
(60-5*y)/6 = 0
(60-5*y)/6 = 0 // * 6
60-5*y = 0
60-5*y = 0 // - 60
-5*y = -60 // : -5
y = -60/(-5)
y = 12
y = 12
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