Answer:
-33/28 or -1 5/28
Explanation:
You would first find a common denominator. It would be 28. Your equation should look like this: -12/28 + -21/28. That equals -33/28 which simplifies to -1 5/28. I hope this is right and helps!
-33/28
-12/28 + -21/28
= -33/28
you can't simplify it so its -33/28
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