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2(3b-)=40
We move all terms to the left:
2(3b-)-(40)=0
We add all the numbers together, and all the variables
2(+3b)-40=0
We multiply parentheses
6b-40=0
We move all terms containing b to the left, all other terms to the right
6b=40
b=40/6
b=6+2/3
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