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y in (-oo:+oo)
(1/2)*y+y-5 = 1000 // - 1000
(1/2)*y+y-1000-5 = 0
3/2*y-1005 = 0 // + 1005
3/2*y = 1005 // : 3/2
y = 1005/3/2
y = 670
y = 670
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