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x in (-oo:+oo)
4/9-(7*x) = -5/9 // + -5/9
4/9-(7*x)-(-5/9) = 0
4/9-7*x+5/9 = 0
1-7*x = 0 // - 1
-7*x = -1 // : -7
x = -1/(-7)
x = 1/7
x = 1/7
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