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(4/7)*x-8 = -604/77 // + -604/77
(4/7)*x-(-604/77)-8 = 0
(4/7)*x+604/77-8 = 0
4/7*x-12/77 = 0 // + 12/77
4/7*x = 12/77 // : 4/7
x = 12/77/4/7
x = 3/11
x = 3/11
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