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c in (-oo:+oo)
c-((1/4)*c) = 75 // - 75
c-((1/4)*c)-75 = 0
c+(-1/4)*c-75 = 0
3/4*c-75 = 0 // + 75
3/4*c = 75 // : 3/4
c = 75/3/4
c = 100
c = 100
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