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(4*x)/12 = 6/9 // - 6/9
(4*x)/12-(6/9) = 0
(4*x)/12-2/3 = 0
1/3*x-2/3 = 0 // + 2/3
1/3*x = 2/3 // : 1/3
x = 2/3/1/3
x = 2
x = 2
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