7=b+3+5

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Solution for 7=b+3+5 equation: 



7=b+3+5

We move all terms to the left:

7-(b+3+5)=0

We add all the numbers together, and all the variables

-(b+8)+7=0

We get rid of parentheses

-b-8+7=0

We add all the numbers together, and all the variables

-1b-1=0

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

-b=1

b=1/-1

b=-1

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