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c in (-oo:+oo)
1*(1/2-c) = 7 // - 7
1*(1/2-c)-7 = 0
1/2-c-7 = 0
-c-13/2 = 0 // + 13/2
-c = 13/2 // * -1
c = -13/2
c = -13/2
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