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c in (-oo:+oo)
8*c+16/3 = c-8 // - c-8
8*c-c+16/3+8 = 0
7*c+40/3 = 0 // - 40/3
7*c = -40/3 // : 7
c = -40/3/7
c = -40/21
c = -40/21
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