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