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c in (-oo:+oo)
(1/2)*(c+6) = 7 // - 7
(1/2)*(c+6)-7 = 0
1/2*(c+6)-7 = 0
1/2*(c+6)-7 = 0
1/2*c-4 = 0
1/2*c-4 = 0
1/2*c-4 = 0 // + 4
1/2*c = 4 // : 1/2
c = 4/1/2
c = 8
c = 8
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