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y in (-oo:+oo)
(2/5)*y = 1/10 // - 1/10
(2/5)*y-(1/10) = 0
(2/5)*y-1/10 = 0
2/5*y-1/10 = 0 // + 1/10
2/5*y = 1/10 // : 2/5
y = 1/10/2/5
y = 1/4
y = 1/4
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