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c in (-oo:+oo)
c/3-7 = 5.3 // - 5.3
c/3-7-5.3 = 0
1/3*c-12.3 = 0 // + 12.3
1/3*c = 12.3 // : 1/3
c = 12.3/1/3
c = 36.90000037
c = 36.90000037
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