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x in (-oo:+oo)
1-(5*x) = -31/9 // + -31/9
1-(5*x)-(-31/9) = 0
31/9-5*x+1 = 0
40/9-5*x = 0 // - 40/9
-5*x = -40/9 // : -5
x = -40/9/(-5)
x = 8/9
x = 8/9
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