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c in (-oo:+oo)
(1/8)*(c+6) = 3 // - 3
(1/8)*(c+6)-3 = 0
1/8*(c+6)-3 = 0
1/8*(c+6)-3 = 0
1/8*c-9/4 = 0
1/8*c-9/4 = 0
1/8*c-9/4 = 0 // + 9/4
1/8*c = 9/4 // : 1/8
c = 9/4/1/8
c = 18
c = 18
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