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c in (-oo:+oo)
3 = (7*c)/3 // - (7*c)/3
3-((7*c)/3) = 0
(-7/3)*c+3 = 0
3-7/3*c = 0 // - 3
-7/3*c = -3 // : -7/3
c = -3/(-7/3)
c = 9/7
c = 9/7
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