21=15+0.50m

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Solution for 21=15+0.50m equation: 



21=15+0.50m

We move all terms to the left:

21-(15+0.50m)=0

We add all the numbers together, and all the variables

-(0.50m+15)+21=0

We get rid of parentheses

-0.50m-15+21=0

We add all the numbers together, and all the variables

-0.5m+6=0

We move all terms containing m to the left, all other terms to the right

-0.5m=-6

m=-6/-0.5

m=+12

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