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c in (-oo:+oo)
(1/2)*(2*c-8) = -10 // + 10
(1/2)*(2*c-8)+10 = 0
1/2*(2*c-8)+10 = 0
1/2*(2*c-8)+10 = 0
c+6 = 0
c+6 = 0
c+6 = 0 // - 6
c = -6
c = -6
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