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c in (-oo:+oo)
20-((1/7)*c) = -9 // + 9
9-((1/7)*c)+20 = 0
(-1/7)*c+9+20 = 0
29-1/7*c = 0 // - 29
-1/7*c = -29 // : -1/7
c = -29/(-1/7)
c = 203
c = 203
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