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(2/5)*x-(7/9) = 73/45 // - 73/45
(2/5)*x-(7/9)-(73/45) = 0
(2/5)*x-7/9-73/45 = 0
2/5*x-12/5 = 0 // + 12/5
2/5*x = 12/5 // : 2/5
x = 12/5/2/5
x = 6
x = 6
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