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x in (-oo:+oo)
(2/3)*(x+8/9)-((1/6)*(1-x)) = -x-1 // + -x-1
(2/3)*(x+8/9)-((1/6)*(1-x))+x+1 = 0
(2/3)*(x+8/9)+(-1/6)*(1-x)+x+1 = 0
2/3*(x+8/9)-1/6*(1-x)+x+1 = 0
2/3*(x+8/9)-1/6*(1-x)+x+1 = 0
5/6*x+x+23/54+1 = 0
11/6*x+23/54+1 = 0
11/6*x+77/54 = 0
11/6*x+77/54 = 0
11/6*x+77/54 = 0 // - 77/54
11/6*x = -77/54 // : 11/6
x = -77/54/11/6
x = -7/9
x = -7/9
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