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x in (-oo:+oo)
x/3-(5/9) = -8/9 // + -8/9
x/3-(5/9)-(-8/9) = 0
x/3-5/9+8/9 = 0
1/3*x+1/3 = 0 // - 1/3
1/3*x = -1/3 // : 1/3
x = -1/3/1/3
x = -1
x = -1
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