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-12m+21-5m=15-17m+6
We move all terms to the left:
-12m+21-5m-(15-17m+6)=0
We add all the numbers together, and all the variables
-12m-5m-(-17m+21)+21=0
We add all the numbers together, and all the variables
-17m-(-17m+21)+21=0
We get rid of parentheses
-17m+17m-21+21=0
We add all the numbers together, and all the variables
=0
m=0/1
m=0
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