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