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(m+m)+3=13
We move all terms to the left:
(m+m)+3-(13)=0
We add all the numbers together, and all the variables
(+2m)+3-13=0
We add all the numbers together, and all the variables
(+2m)-10=0
We get rid of parentheses
2m-10=0
We move all terms containing m to the left, all other terms to the right
2m=10
m=10/2
m=5
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