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x in (-oo:+oo)
(2/7)*x+1/7 = -5/7 // + -5/7
(2/7)*x+1/7-(-5/7) = 0
(2/7)*x+1/7+5/7 = 0
2/7*x+6/7 = 0 // - 6/7
2/7*x = -6/7 // : 2/7
x = -6/7/2/7
x = -3
x = -3
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