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(6/7)*x-1 = -3/7 // + -3/7
(6/7)*x-(-3/7)-1 = 0
(6/7)*x+3/7-1 = 0
6/7*x-4/7 = 0 // + 4/7
6/7*x = 4/7 // : 6/7
x = 4/7/6/7
x = 2/3
x = 2/3
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