7+5b=b+21

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Solution for 7+5b=b+21 equation: 



7+5b=b+21

We move all terms to the left:

7+5b-(b+21)=0

We get rid of parentheses

5b-b-21+7=0

We add all the numbers together, and all the variables

4b-14=0

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

4b=14

b=14/4

b=3+1/2

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