21b+9=15b+3=

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Solution for 21b+9=15b+3= equation: 



21b+9=15b+3=

We move all terms to the left:

21b+9-(15b+3)=0

We get rid of parentheses

21b-15b-3+9=0

We add all the numbers together, and all the variables

6b+6=0

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

6b=-6

b=-6/6

b=-1

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