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(m+52)+m=90
We move all terms to the left:
(m+52)+m-(90)=0
We add all the numbers together, and all the variables
m+(m+52)-90=0
We get rid of parentheses
m+m+52-90=0
We add all the numbers together, and all the variables
2m-38=0
We move all terms containing m to the left, all other terms to the right
2m=38
m=38/2
m=19
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