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