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c in (-oo:+oo)
(1/2)*(c+2) = 4 // - 4
(1/2)*(c+2)-4 = 0
1/2*(c+2)-4 = 0
1/2*(c+2)-4 = 0
1/2*c-3 = 0
1/2*c-3 = 0
1/2*c-3 = 0 // + 3
1/2*c = 3 // : 1/2
c = 3/1/2
c = 6
c = 6
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