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c in (-oo:+oo)
(1/3)*(c+2) = 1 // - 1
(1/3)*(c+2)-1 = 0
1/3*(c+2)-1 = 0
1/3*(c+2)-1 = 0
1/3*c-1/3 = 0
1/3*c-1/3 = 0
1/3*c-1/3 = 0 // + 1/3
1/3*c = 1/3 // : 1/3
c = 1/3/1/3
c = 1
c = 1
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