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(5/7)*(6*x+9) = 14 // - 14
(5/7)*(6*x+9)-14 = 0
5/7*(6*x+9)-14 = 0
5/7*(6*x+9)-14 = 0
30/7*x-53/7 = 0
30/7*x-53/7 = 0
30/7*x-53/7 = 0 // + 53/7
30/7*x = 53/7 // : 30/7
x = 53/7/30/7
x = 53/30
x = 53/30
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