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x in (-oo:+oo)
3500/5 = 10*x // - 10*x
3500/5-(10*x) = 0
3500/5-10*x = 0
700-10*x = 0 // - 700
-10*x = -700 // : -10
x = -700/(-10)
x = 70
x = 70
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