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(4/9)*x-3 = 13/9 // - 13/9
(4/9)*x-(13/9)-3 = 0
(4/9)*x-13/9-3 = 0
4/9*x-40/9 = 0 // + 40/9
4/9*x = 40/9 // : 4/9
x = 40/9/4/9
x = 10
x = 10
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