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4b=20-6b
We move all terms to the left:
4b-(20-6b)=0
We add all the numbers together, and all the variables
4b-(-6b+20)=0
We get rid of parentheses
4b+6b-20=0
We add all the numbers together, and all the variables
10b-20=0
We move all terms containing b to the left, all other terms to the right
10b=20
b=20/10
b=2
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