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x in (-oo:+oo)
x/5 = x-(2/7) // - x-(2/7)
x/5-x+2/7 = 0
2/7-4/5*x = 0 // - 2/7
-4/5*x = -2/7 // : -4/5
x = -2/7/(-4/5)
x = 5/14
x = 5/14
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