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y in (-oo:+oo)
4-((1/2)*(y+7)) = -11 // + 11
4-((1/2)*(y+7))+11 = 0
(-1/2)*(y+7)+4+11 = 0
4-1/2*(y+7)+11 = 0
4-1/2*(y+7)+11 = 0
1/2-1/2*y+11 = 0
23/2-1/2*y = 0
23/2-1/2*y = 0
23/2-1/2*y = 0 // - 23/2
-1/2*y = -23/2 // : -1/2
y = -23/2/(-1/2)
y = 23
y = 23
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