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x in (-oo:+oo)
(2/7)*x+4/7 = -8/7 // + -8/7
(2/7)*x+4/7-(-8/7) = 0
(2/7)*x+4/7+8/7 = 0
2/7*x+12/7 = 0 // - 12/7
2/7*x = -12/7 // : 2/7
x = -12/7/2/7
x = -6
x = -6
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