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x in (-oo:+oo)
2*x+8/9 = -10/9 // + -10/9
2*x+8/9-(-10/9) = 0
2*x+8/9+10/9 = 0
2*x+2 = 0 // - 2
2*x = -2 // : 2
x = -2/2
x = -1
x = -1
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