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c in (-oo:+oo)
(1/2)*(c-6) = (1/4)*c // - (1/4)*c
(1/2)*(c-6)-((1/4)*c) = 0
(1/2)*(c-6)+(-1/4)*c = 0
1/2*(c-6)-c/4 = 0
(1/2*4*(c-6))/4-c/4 = 0
1/2*4*(c-6)-c = 0
c-12 = 0
(c-12)/4 = 0
(c-12)/4 = 0 // * 4
c-12 = 0
c-12 = 0 // + 12
c = 12
c = 12
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