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c in (-oo:+oo)
c/3 = 61/7 // - 61/7
c/3-(61/7) = 0
c/3-61/7 = 0
1/3*c-61/7 = 0 // + 61/7
1/3*c = 61/7 // : 1/3
c = 61/7/1/3
c = 183/7
c = 183/7
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