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y in (-oo:+oo)
(5/2)*y = 2*y+10 // - 2*y+10
(5/2)*y-(2*y)-10 = 0
(5/2)*y-2*y-10 = 0
1/2*y-10 = 0 // + 10
1/2*y = 10 // : 1/2
y = 10/1/2
y = 20
y = 20
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