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(2/7)*(x-9)-4 = 0
2/7*(x-9)-4 = 0
2/7*(x-9)-4 = 0
2/7*x-46/7 = 0
2/7*x-46/7 = 0
2/7*x-46/7 = 0 // + 46/7
2/7*x = 46/7 // : 2/7
x = 46/7/2/7
x = 23
x = 23
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