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c in (-oo:+oo)
(1/3)*(c-2)+7/3 = 0
1/3*(c-2)+7/3 = 0
(1/3*3*(c-2))/3+7/3 = 0
1/3*3*(c-2)+7 = 0
c+5 = 0
(c+5)/3 = 0
(c+5)/3 = 0 // * 3
c+5 = 0
c+5 = 0 // - 5
c = -5
c = -5
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