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-359=19-21m
We move all terms to the left:
-359-(19-21m)=0
We add all the numbers together, and all the variables
-(-21m+19)-359=0
We get rid of parentheses
21m-19-359=0
We add all the numbers together, and all the variables
21m-378=0
We move all terms containing m to the left, all other terms to the right
21m=378
m=378/21
m=18
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