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y in (-oo:+oo)
(1/2)*(y+7) = 17 // - 17
(1/2)*(y+7)-17 = 0
1/2*(y+7)-17 = 0
1/2*(y+7)-17 = 0
1/2*y-27/2 = 0
1/2*y-27/2 = 0
1/2*y-27/2 = 0 // + 27/2
1/2*y = 27/2 // : 1/2
y = 27/2/1/2
y = 27
y = 27
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