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c in (-oo:+oo)
(10*c)/4-((8*c)/4)-((2*c)/5)+3/5 = 0
(10*c)/4-2*c+(-2/5)*c+3/5 = 0
1/10*c+3/5 = 0 // - 3/5
1/10*c = -3/5 // : 1/10
c = -3/5/1/10
c = -6
c = -6
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