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x in (-oo:+oo)
(1/4)*(x-4) = (1/4)*x-4 // - (1/4)*x-4
(1/4)*(x-4)-((1/4)*x)+4 = 0
(1/4)*(x-4)+(-1/4)*x+4 = 0
1/4*(x-4)-x/4+4 = 0
(1/4*4*(x-4))/4-x/4+(4^2)/4 = 0
1/4*4*(x-4)-x+16 = 0
16-4 = 0
12 = 0
12/4 = 0
12/4 = 0 // * 4
12 = 0
x belongs to the empty set
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