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c in (-oo:+oo)
(2/7)*(c+4) = 6 // - 6
(2/7)*(c+4)-6 = 0
2/7*(c+4)-6 = 0
2/7*(c+4)-6 = 0
2/7*c-34/7 = 0
2/7*c-34/7 = 0
2/7*c-34/7 = 0 // + 34/7
2/7*c = 34/7 // : 2/7
c = 34/7/2/7
c = 17
c = 17
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