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c in (-oo:+oo)
(3/4)*c = 8/9 // - 8/9
(3/4)*c-(8/9) = 0
(3/4)*c-8/9 = 0
3/4*c-8/9 = 0 // + 8/9
3/4*c = 8/9 // : 3/4
c = 8/9/3/4
c = 32/27
c = 32/27
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