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x in (-oo:+oo)
3500/25 = 10*x // - 10*x
3500/25-(10*x) = 0
3500/25-10*x = 0
140-10*x = 0 // - 140
-10*x = -140 // : -10
x = -140/(-10)
x = 14
x = 14
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