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b=10+3b
We move all terms to the left:
b-(10+3b)=0
We add all the numbers together, and all the variables
b-(3b+10)=0
We get rid of parentheses
b-3b-10=0
We add all the numbers together, and all the variables
-2b-10=0
We move all terms containing b to the left, all other terms to the right
-2b=10
b=10/-2
b=-5
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