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c in (-oo:+oo)
c/3-2.1 = 5.3 // - 5.3
c/3-5.3-2.1 = 0
1/3*c-7.4 = 0 // + 7.4
1/3*c = 7.4 // : 1/3
c = 7.4/1/3
c = 22.20000022
c = 22.20000022
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