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c in (-oo:+oo)
18-c = (4/5)*c // - (4/5)*c
18-c-((4/5)*c) = 0
(-4/5)*c-c+18 = 0
18-9/5*c = 0 // - 18
-9/5*c = -18 // : -9/5
c = -18/(-9/5)
c = 10
c = 10
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