42+-21m=21m+-21m

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Solution for 42+-21m=21m+-21m equation: 



42+-21m=21m+-21m

We move all terms to the left:

42+-21m-(21m+-21m)=0

We add all the numbers together, and all the variables

-21m+42-0+=0

We add all the numbers together, and all the variables

-21m=0

m=0/-21

m=0

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