Answer:
y=33
Explanation:
First you subtract 21 on both sides then you will get -y=-33 then you divide by -1 on both side and you will get y=33
To find the value of y, you need to isolate the variable. To do this, add 21 to -12. This gives you 9. Now, you're equation is set as 9 = y. This means that the value of y is 9.
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