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