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