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(2*x)/7 = 22.4 // - 22.4
(2*x)/7-22.4 = 0
2/7*x-22.4 = 0 // + 22.4
2/7*x = 22.4 // : 2/7
x = 22.4/2/7
x = 78.39999882
x = 78.39999882
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