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Maybe it's because I'm not a native English speaker but what does "divide into" mean?

I'm a native English speaker, and I've never heard that phrase either. I assume it's the same as "divide by", but I could be wrong.

Divide into is the opposite of Divide by. X2 into 1500 is 1500/X2

DIVIDE X2 INTO 1500 GIVING Y => Y=1500/X2