6b=15+21

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Solution for 6b=15+21 equation: 



6b=15+21

We move all terms to the left:

6b-(15+21)=0

We add all the numbers together, and all the variables

6b-36=0

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

6b=36

b=36/6

b=6

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