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y in (-oo:+oo)
(1/2)*y-(5*(1/2)) = 8 // - 8
(1/2)*y-(5*(1/2))-8 = 0
(1/2)*y-5/2-8 = 0
1/2*y-21/2 = 0 // + 21/2
1/2*y = 21/2 // : 1/2
y = 21/2/1/2
y = 21
y = 21
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