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c in (-oo:+oo)
7*c-(5/3) = -15 // + 15
7*c-(5/3)+15 = 0
7*c-5/3+15 = 0
7*c+40/3 = 0 // - 40/3
7*c = -40/3 // : 7
c = -40/3/7
c = -40/21
c = -40/21
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