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(4/9)*x-(2/5) = (7/9)*x-(8/5) // - (7/9)*x-(8/5)
(4/9)*x-((7/9)*x)-(2/5)+8/5 = 0
(4/9)*x+(-7/9)*x-2/5+8/5 = 0
6/5-1/3*x = 0 // - 6/5
-1/3*x = -6/5 // : -1/3
x = -6/5/(-1/3)
x = 18/5
x = 18/5
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