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x in (-oo:+oo)
x-(2/7) = 1-(x/2) // - 1-(x/2)
x+x/2-(2/7)-1 = 0
x+x/2-2/7-1 = 0
3/2*x-9/7 = 0 // + 9/7
3/2*x = 9/7 // : 3/2
x = 9/7/3/2
x = 6/7
x = 6/7
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