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x in (-oo:+oo)
7/9-(x/3) = 4/9 // - 4/9
7/9-(x/3)-(4/9) = 0
7/9-(x/3)-4/9 = 0
1/3-1/3*x = 0 // - 1/3
-1/3*x = -1/3 // : -1/3
x = -1/3/(-1/3)
x = 1
x = 1
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