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