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c in (-oo:+oo)
13.2/20 = c/10 // - c/10
13.2/20-(c/10) = 0
0.66-1/10*c = 0 // - 0.66
-1/10*c = -0.66 // : -1/10
c = -0.66/(-1/10)
c = 6.6
c = 6.6
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