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(2/7)*x+9 = 67/7-(2*x) // - 67/7-(2*x)
(2/7)*x+2*x-(67/7)+9 = 0
(2/7)*x+2*x-67/7+9 = 0
16/7*x-4/7 = 0 // + 4/7
16/7*x = 4/7 // : 16/7
x = 4/7/16/7
x = 1/4
x = 1/4
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