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c in (-oo:+oo)
7.2 = (3/4)*c // - (3/4)*c
7.2-((3/4)*c) = 0
(-3/4)*c+7.2 = 0
7.2-3/4*c = 0 // - 7.2
-3/4*c = -7.2 // : -3/4
c = -7.2/(-3/4)
c = 9.6
c = 9.6
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