15b+21-5b=10b+21

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Solution for 15b+21-5b=10b+21 equation: 



15b+21-5b=10b+21

We move all terms to the left:

15b+21-5b-(10b+21)=0

We add all the numbers together, and all the variables

10b-(10b+21)+21=0

We get rid of parentheses

10b-10b-21+21=0

We add all the numbers together, and all the variables

=0

b=0/1

b=0

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