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y in (-oo:+oo)
11-((1/2)*y) = 7/2 // - 7/2
11-((1/2)*y)-(7/2) = 0
(-1/2)*y-7/2+11 = 0
15/2-1/2*y = 0 // - 15/2
-1/2*y = -15/2 // : -1/2
y = -15/2/(-1/2)
y = 15
y = 15
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