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y in (-oo:+oo)
(2*y)/3-(y/2) = 15 // - 15
(2*y)/3-(y/2)-15 = 0
1/6*y-15 = 0 // + 15
1/6*y = 15 // : 1/6
y = 15/1/6
y = 90
y = 90
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