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x in (-oo:+oo)
3/5+3 = 21*x // - 21*x
3/5-(21*x)+3 = 0
3/5-21*x+3 = 0
18/5-21*x = 0 // - 18/5
-21*x = -18/5 // : -21
x = -18/5/(-21)
x = 6/35
x = 6/35
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