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