m=18-m

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Solution for m=18-m equation: 



m=18-m

We move all terms to the left:

m-(18-m)=0

We add all the numbers together, and all the variables

m-(-1m+18)=0

We get rid of parentheses

m+1m-18=0

We add all the numbers together, and all the variables

2m-18=0

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

2m=18

m=18/2

m=9

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