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(2/3)*x-4 = 5/7 // - 5/7
(2/3)*x-(5/7)-4 = 0
(2/3)*x-5/7-4 = 0
2/3*x-33/7 = 0 // + 33/7
2/3*x = 33/7 // : 2/3
x = 33/7/2/3
x = 99/14
x = 99/14
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