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(3/7)*x+3 = 261/77 // - 261/77
(3/7)*x-(261/77)+3 = 0
(3/7)*x-261/77+3 = 0
3/7*x-30/77 = 0 // + 30/77
3/7*x = 30/77 // : 3/7
x = 30/77/3/7
x = 10/11
x = 10/11
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