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x in (-oo:+oo)
(2/3)*x-(5/9) = -31/27 // + -31/27
(2/3)*x-(5/9)-(-31/27) = 0
(2/3)*x-5/9+31/27 = 0
2/3*x+16/27 = 0 // - 16/27
2/3*x = -16/27 // : 2/3
x = -16/27/2/3
x = -8/9
x = -8/9
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