Агр0др0н 0прыски8втель к8вдр0к0птер dr0n XbG P40 V40 XP 06приску8в4, Ukraine

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Today the dean told...
There is an equation like 15 25=4x(//tractor-service.com)
Find accordingly x
Do you know what answer some students write? x=0! Do you know why?
15 25=40 (x is simply replaced by zero!)
Reminiscent of SQL injection, however :)