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