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(2/7)*x-(2/3) = -106/231 // + -106/231
(2/7)*x-(2/3)-(-106/231) = 0
(2/7)*x-2/3+106/231 = 0
2/7*x-16/77 = 0 // + 16/77
2/7*x = 16/77 // : 2/7
x = 16/77/2/7
x = 8/11
x = 8/11
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