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c in (-oo:+oo)
2*c-(15/7) = (2*c)/9 // - (2*c)/9
2*c-((2*c)/9)-(15/7) = 0
2*c+(-2/9)*c-15/7 = 0
16/9*c-15/7 = 0 // + 15/7
16/9*c = 15/7 // : 16/9
c = 15/7/16/9
c = 135/112
c = 135/112
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