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x in (-oo:+oo)
x+1/5 = 3*x-(2/7) // - 3*x-(2/7)
x-(3*x)+1/5+2/7 = 0
x-3*x+1/5+2/7 = 0
17/35-2*x = 0 // - 17/35
-2*x = -17/35 // : -2
x = -17/35/(-2)
x = 17/70
x = 17/70
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