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2(19+b)=70
We move all terms to the left:
2(19+b)-(70)=0
We add all the numbers together, and all the variables
2(b+19)-70=0
We multiply parentheses
2b+38-70=0
We add all the numbers together, and all the variables
2b-32=0
We move all terms containing b to the left, all other terms to the right
2b=32
b=32/2
b=16
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