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c in (-oo:+oo)
3*(c-4) = 72/12 // - 72/12
3*(c-4)-(72/12) = 0
3*(c-4)-6 = 0
3*(c-4)-6 = 0
3*c-18 = 0
3*c-18 = 0
3*c-18 = 0 // + 18
3*c = 18 // : 3
c = 18/3
c = 6
c = 6
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