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