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