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