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