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y in (-oo:+oo)
(2/5)*y+3 = 8 // - 8
(2/5)*y-8+3 = 0
2/5*y-5 = 0 // + 5
2/5*y = 5 // : 2/5
y = 5/2/5
y = 25/2
y = 25/2
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