-30+15--9-6=
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for integers with tow different signs, it will always be negative in multiplying and division. for adding and subtracting, the sign is for the bigger number.
They are different operations, giving different results. Example: 1+1=2, 1*1=1.
The numbers can have a positive or negative sign.
Prime is counting 5 times (adding)
That's the distributive property.