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y in (-oo:+oo)
15*y-(4/5) = 1/5 // - 1/5
15*y-(4/5)-(1/5) = 0
15*y-4/5-1/5 = 0
15*y-1 = 0 // + 1
15*y = 1 // : 15
y = 1/15
y = 1/15
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