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(2/7)*x+4/7 = -6/7 // + -6/7
(2/7)*x+4/7-(-6/7) = 0
(2/7)*x+4/7+6/7 = 0
2/7*x+10/7 = 0 // - 10/7
2/7*x = -10/7 // : 2/7
x = -10/7/2/7
x = -5
x = -5
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