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c in (-oo:+oo)
(1/2)*(c+5) = 6 // - 6
(1/2)*(c+5)-6 = 0
1/2*(c+5)-6 = 0
1/2*(c+5)-6 = 0
1/2*c-7/2 = 0
1/2*c-7/2 = 0
1/2*c-7/2 = 0 // + 7/2
1/2*c = 7/2 // : 1/2
c = 7/2/1/2
c = 7
c = 7
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