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1-((4/9)*x) = 2/7 // - 2/7
1-((4/9)*x)-(2/7) = 0
(-4/9)*x-2/7+1 = 0
5/7-4/9*x = 0 // - 5/7
-4/9*x = -5/7 // : -4/9
x = -5/7/(-4/9)
x = 45/28
x = 45/28
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