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(16*x)/63 = 9/7 // - 9/7
(16*x)/63-(9/7) = 0
(16*x)/63-9/7 = 0
16/63*x-9/7 = 0 // + 9/7
16/63*x = 9/7 // : 16/63
x = 9/7/16/63
x = 81/16
x = 81/16
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