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x in (-oo:+oo)
3/7-(1/5) = x/25 // - x/25
3/7-(x/25)-(1/5) = 0
3/7-(x/25)-1/5 = 0
8/35-1/25*x = 0 // - 8/35
-1/25*x = -8/35 // : -1/25
x = -8/35/(-1/25)
x = 40/7
x = 40/7
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