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x in (-oo:+oo)
3500/30 = 10*x // - 10*x
3500/30-(10*x) = 0
3500/30-10*x = 0
350/3-10*x = 0 // - 350/3
-10*x = -350/3 // : -10
x = -350/3/(-10)
x = 35/3
x = 35/3
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