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x in (-oo:+oo)
3/7 = 15*x // - 15*x
3/7-(15*x) = 0
3/7-15*x = 0
3/7-15*x = 0 // - 3/7
-15*x = -3/7 // : -15
x = -3/7/(-15)
x = 1/35
x = 1/35
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