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y in (-oo:+oo)
(1/2)*(2/5)*y = 4/125 // - 4/125
(1/2)*(2/5)*y-(4/125) = 0
(1/2)*(2/5)*y-4/125 = 0
1/5*y-4/125 = 0 // + 4/125
1/5*y = 4/125 // : 1/5
y = 4/125/1/5
y = 4/25
y = 4/25
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