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c in (-oo:+oo)
(3*c)/5-((2*c)/7) = 500 // - 500
(3*c)/5-((2*c)/7)-500 = 0
(3*c)/5+(-2/7)*c-500 = 0
11/35*c-500 = 0 // + 500
11/35*c = 500 // : 11/35
c = 500/11/35
c = 17500/11
c = 17500/11
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