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c in (-oo:+oo)
4*(c+1/4) = 21/3 // - 21/3
4*(c+1/4)-(21/3) = 0
4*(c+1/4)-7 = 0
4*(c+1/4)-7 = 0
4*c-6 = 0
4*c-6 = 0
4*c-6 = 0 // + 6
4*c = 6 // : 4
c = 6/4
c = 3/2
c = 3/2
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