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x in (-oo:+oo)
2*x-(13/(-7)) = 1 // - 1
2*x-(13/(-7))-1 = 0
2*x+13/7-1 = 0
2*x+6/7 = 0 // - 6/7
2*x = -6/7 // : 2
x = -6/7/2
x = -3/7
x = -3/7
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