10b+3=4b+21

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Solution for 10b+3=4b+21 equation: 



10b+3=4b+21

We move all terms to the left:

10b+3-(4b+21)=0

We get rid of parentheses

10b-4b-21+3=0

We add all the numbers together, and all the variables

6b-18=0

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

6b=18

b=18/6

b=3

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