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x in (-oo:+oo)
(2/5)*x = x-(1/7) // - x-(1/7)
(2/5)*x-x+1/7 = 0
1/7-3/5*x = 0 // - 1/7
-3/5*x = -1/7 // : -3/5
x = -1/7/(-3/5)
x = 5/21
x = 5/21
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