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x in (-oo:+oo)
3-((1.2/3)*x) = 8/9 // - 8/9
3-((1.2/3)*x)-(8/9) = 0
3-0.4*x-8/9 = 0
19/9-0.4*x = 0 // - 19/9
-0.4*x = -19/9 // : -0.4
x = -19/9/(-0.4)
x = 5.27777778
x = 5.27777778
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