1+7(1+7m)=400

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Solution for 1+7(1+7m)=400 equation: 



1+7(1+7m)=400

We move all terms to the left:

1+7(1+7m)-(400)=0

We add all the numbers together, and all the variables

7(7m+1)+1-400=0

We add all the numbers together, and all the variables

7(7m+1)-399=0

We multiply parentheses

49m+7-399=0

We add all the numbers together, and all the variables

49m-392=0

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

49m=392

m=392/49

m=8

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