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y in (-oo:+oo)
y/3+y/6 = (2*y)/9+15 // - (2*y)/9+15
y/3+y/6-((2*y)/9)-15 = 0
y/3+y/6+(-2/9)*y-15 = 0
5/18*y-15 = 0 // + 15
5/18*y = 15 // : 5/18
y = 15/5/18
y = 54
y = 54
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