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