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y in (-oo:+oo)
(2/5)*y+(1/5)*y = 9 // - 9
(2/5)*y+(1/5)*y-9 = 0
3/5*y-9 = 0 // + 9
3/5*y = 9 // : 3/5
y = 9/3/5
y = 15
y = 15
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