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(1/2)*(2*x-1) = 1/7-(3/7) // - 1/7-(3/7)
(1/2)*(2*x-1)-(1/7)+3/7 = 0
(1/2)*(2*x-1)-1/7+3/7 = 0
1/2*(2*x-1)-1/7+3/7 = 0
(1/2*7*(2*x-1))/7-1/7+3/7 = 0
1/2*7*(2*x-1)-1+3 = 0
7*x-9/2+3 = 0
7*x-3/2 = 0
(7*x-3/2)/7 = 0
(7*x-3/2)/7 = 0 // * 7
7*x-3/2 = 0
7*x-3/2 = 0 // + 3/2
7*x = 3/2 // : 7
x = 3/2/7
x = 3/14
x = 3/14
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