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c in (-oo:+oo)
(1/2)*(c+8) = (1/4)*c // - (1/4)*c
(1/2)*(c+8)-((1/4)*c) = 0
(1/2)*(c+8)+(-1/4)*c = 0
1/2*(c+8)-c/4 = 0
(1/2*4*(c+8))/4-c/4 = 0
1/2*4*(c+8)-c = 0
c+16 = 0
(c+16)/4 = 0
(c+16)/4 = 0 // * 4
c+16 = 0
c+16 = 0 // - 16
c = -16
c = -16
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