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c in (-oo:+oo)
(4*c)/3 = 2/7 // - 2/7
(4*c)/3-(2/7) = 0
(4*c)/3-2/7 = 0
4/3*c-2/7 = 0 // + 2/7
4/3*c = 2/7 // : 4/3
c = 2/7/4/3
c = 3/14
c = 3/14
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