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