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x in (-oo:+oo)
2/7-2*x = -5/7 // + -5/7
2/7-2*x-(-5/7) = 0
2/7-2*x+5/7 = 0
1-2*x = 0 // - 1
-2*x = -1 // : -2
x = -1/(-2)
x = 1/2
x = 1/2
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