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c in (-oo:+oo)
2*c-(7/3) = 15 // - 15
2*c-(7/3)-15 = 0
2*c-7/3-15 = 0
2*c-52/3 = 0 // + 52/3
2*c = 52/3 // : 2
c = 52/3/2
c = 26/3
c = 26/3
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