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c in (-oo:+oo)
(2*c)/7 = 3/4 // - 3/4
(2*c)/7-(3/4) = 0
(2*c)/7-3/4 = 0
2/7*c-3/4 = 0 // + 3/4
2/7*c = 3/4 // : 2/7
c = 3/4/2/7
c = 21/8
c = 21/8
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