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y in (-oo:+oo)
2*y = 4*(4/5)-2 // - 4*(4/5)-2
2*y-(4*(4/5))+2 = 0
2*y-16/5+2 = 0
2*y-6/5 = 0 // + 6/5
2*y = 6/5 // : 2
y = 6/5/2
y = 3/5
y = 3/5
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