5b+21=6b+18

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Solution for 5b+21=6b+18 equation: 



5b+21=6b+18

We move all terms to the left:

5b+21-(6b+18)=0

We get rid of parentheses

5b-6b-18+21=0

We add all the numbers together, and all the variables

-1b+3=0

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

-b=-3

b=-3/-1

b=+3

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