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y in (-oo:+oo)
2*y = 8/5 // - 8/5
2*y-(8/5) = 0
2*y-8/5 = 0
2*y-8/5 = 0 // + 8/5
2*y = 8/5 // : 2
y = 8/5/2
y = 4/5
y = 4/5
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