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x in (-oo:+oo)
3500/50 = 5*x // - 5*x
3500/50-(5*x) = 0
3500/50-5*x = 0
70-5*x = 0 // - 70
-5*x = -70 // : -5
x = -70/(-5)
x = 14
x = 14
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