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x in (-oo:+oo)
(6/12)*x+8/12 = 9/12 // - 9/12
(6/12)*x+8/12-(9/12) = 0
(6/12)*x+8/12-3/4 = 0
1/2*x-1/12 = 0 // + 1/12
1/2*x = 1/12 // : 1/2
x = 1/12/1/2
x = 1/6
x = 1/6
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