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C in (-oo:+oo)
(1/2)*(C+2) = 7 // - 7
(1/2)*(C+2)-7 = 0
1/2*(C+2)-7 = 0
1/2*(C+2)-7 = 0
1/2*C-6 = 0
1/2*C-6 = 0
1/2*C-6 = 0 // + 6
1/2*C = 6 // : 1/2
C = 6/1/2
C = 12
C = 12
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