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1-((5/4)*x) = 4/9 // - 4/9
1-((5/4)*x)-(4/9) = 0
(-5/4)*x-4/9+1 = 0
5/9-5/4*x = 0 // - 5/9
-5/4*x = -5/9 // : -5/4
x = -5/9/(-5/4)
x = 4/9
x = 4/9
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