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(4/9)*x-4 = 2/3 // - 2/3
(4/9)*x-(2/3)-4 = 0
(4/9)*x-2/3-4 = 0
4/9*x-14/3 = 0 // + 14/3
4/9*x = 14/3 // : 4/9
x = 14/3/4/9
x = 21/2
x = 21/2
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