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y in (-oo:+oo)
(2/5)*y-2 = 1/4 // - 1/4
(2/5)*y-(1/4)-2 = 0
(2/5)*y-1/4-2 = 0
2/5*y-9/4 = 0 // + 9/4
2/5*y = 9/4 // : 2/5
y = 9/4/2/5
y = 45/8
y = 45/8
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