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(4/9)*x-(2/3) = 12 // - 12
(4/9)*x-(2/3)-12 = 0
(4/9)*x-2/3-12 = 0
4/9*x-38/3 = 0 // + 38/3
4/9*x = 38/3 // : 4/9
x = 38/3/4/9
x = 57/2
x = 57/2
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