-5 is not equal to 5. Their magnitudes are equal, but their signs are opposite.
A withdrawal of $5 from my bank account is much different from a $5 deposit to it.
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4m-5 equals = -1
a equals 5
a( 10 ) - b( 5 ) = 5 ?
No, because 5 over 1 equals 5 and 1 over 5 equals 5 but 5 over 5 equals 1