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c in (-oo:+oo)
63 = (9/5)*c // - (9/5)*c
63-((9/5)*c) = 0
(-9/5)*c+63 = 0
63-9/5*c = 0 // - 63
-9/5*c = -63 // : -9/5
c = -63/(-9/5)
c = 35
c = 35
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