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