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x in (-oo:+oo)
3500/30 = 15*x // - 15*x
3500/30-(15*x) = 0
3500/30-15*x = 0
350/3-15*x = 0 // - 350/3
-15*x = -350/3 // : -15
x = -350/3/(-15)
x = 70/9
x = 70/9
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