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Using substitution, evaluate the expression b-a, if a = -14 and b = -7.
O 21
O -21
-7
7.
Please help
![Using Substitution Evaluate The Expression Ba If A 14 And B 7 O 21 O 21 7 7 Please Help class=](https://us-static.z-dn.net/files/d37/e99336c90a3ca7494f212ebedb19a83d.png)