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3b-30-7b=2b-18
We move all terms to the left:
3b-30-7b-(2b-18)=0
We add all the numbers together, and all the variables
-4b-(2b-18)-30=0
We get rid of parentheses
-4b-2b+18-30=0
We add all the numbers together, and all the variables
-6b-12=0
We move all terms containing b to the left, all other terms to the right
-6b=12
b=12/-6
b=-2
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