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c in (-oo:+oo)
7/4-((3/5)*c) = 0
(-3/5)*c+7/4 = 0
7/4-3/5*c = 0 // - 7/4
-3/5*c = -7/4 // : -3/5
c = -7/4/(-3/5)
c = 35/12
c = 35/12
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