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(4/3)*x = 12/21 // - 12/21
(4/3)*x-(12/21) = 0
(4/3)*x-4/7 = 0
4/3*x-4/7 = 0 // + 4/7
4/3*x = 4/7 // : 4/3
x = 4/7/4/3
x = 3/7
x = 3/7
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