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x in (-oo:+oo)
(1/2)*(x-6) = 1/2 // - 1/2
(1/2)*(x-6)-(1/2) = 0
(1/2)*(x-6)-1/2 = 0
1/2*(x-6)-1/2 = 0
(1/2*2*(x-6))/2-1/2 = 0
1/2*2*(x-6)-1 = 0
x-7 = 0
(x-7)/2 = 0
(x-7)/2 = 0 // * 2
x-7 = 0
x-7 = 0 // + 7
x = 7
x = 7
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