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