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(2/7)*x+x-8 = 16/7 // - 16/7
(2/7)*x+x-(16/7)-8 = 0
(2/7)*x+x-16/7-8 = 0
9/7*x-72/7 = 0 // + 72/7
9/7*x = 72/7 // : 9/7
x = 72/7/9/7
x = 8
x = 8
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