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c in (-oo:+oo)
(1/3)*(12*c-9) = -7 // + 7
(1/3)*(12*c-9)+7 = 0
1/3*(12*c-9)+7 = 0
1/3*(12*c-9)+7 = 0
4*c+4 = 0
4*c+4 = 0
4*c+4 = 0 // - 4
4*c = -4 // : 4
c = -4/4
c = -1
c = -1
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