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