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6b=-30+3b
We move all terms to the left:
6b-(-30+3b)=0
We add all the numbers together, and all the variables
6b-(3b-30)=0
We get rid of parentheses
6b-3b+30=0
We add all the numbers together, and all the variables
3b+30=0
We move all terms containing b to the left, all other terms to the right
3b=-30
b=-30/3
b=-10
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