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