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x in (-oo:+oo)
3/30 = 140*x // - 140*x
3/30-(140*x) = 0
3/30-140*x = 0
1/10-140*x = 0 // - 1/10
-140*x = -1/10 // : -140
x = -1/10/(-140)
x = 1/1400
x = 1/1400
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