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c in (-oo:+oo)
8*((1/2)*c+1/2)+3 = 5*c-c+7 // - 5*c-c+7
8*((1/2)*c+1/2)-(5*c)+c-7+3 = 0
8*((1/2)*c+1/2)-5*c+c-7+3 = 0
8*(1/2*c+1/2)-5*c+c-7+3 = 0
8*(1/2*c+1/2)-5*c+c-7+3 = 0
c-c-7+3+4 = 0
3-7+4 = 0
3-3 = 0
0 = 0
0 = 0
c belongs to the empty set
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