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b+21=6b-29
We move all terms to the left:
b+21-(6b-29)=0
We get rid of parentheses
b-6b+29+21=0
We add all the numbers together, and all the variables
-5b+50=0
We move all terms containing b to the left, all other terms to the right
-5b=-50
b=-50/-5
b=+10
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