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c in (-oo:+oo)
c/3 = 43/7 // - 43/7
c/3-(43/7) = 0
c/3-43/7 = 0
1/3*c-43/7 = 0 // + 43/7
1/3*c = 43/7 // : 1/3
c = 43/7/1/3
c = 129/7
c = 129/7
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