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6.4*x = 4/7 // - 4/7
6.4*x-(4/7) = 0
6.4*x-4/7 = 0
6.4*x-4/7 = 0 // + 4/7
6.4*x = 4/7 // : 6.4
x = 4/7/6.4
x = 0.08928571
x = 0.08928571
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