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y in (-oo:+oo)
(2/5)*y = 4/3 // - 4/3
(2/5)*y-(4/3) = 0
(2/5)*y-4/3 = 0
2/5*y-4/3 = 0 // + 4/3
2/5*y = 4/3 // : 2/5
y = 4/3/2/5
y = 10/3
y = 10/3
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