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