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y in (-oo:+oo)
(2/5)*y = 2/7 // - 2/7
(2/5)*y-(2/7) = 0
(2/5)*y-2/7 = 0
2/5*y-2/7 = 0 // + 2/7
2/5*y = 2/7 // : 2/5
y = 2/7/2/5
y = 5/7
y = 5/7
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