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10+3b=-b-10
We move all terms to the left:
10+3b-(-b-10)=0
We add all the numbers together, and all the variables
3b-(-1b-10)+10=0
We get rid of parentheses
3b+1b+10+10=0
We add all the numbers together, and all the variables
4b+20=0
We move all terms containing b to the left, all other terms to the right
4b=-20
b=-20/4
b=-5
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