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4(10+b)=80
We move all terms to the left:
4(10+b)-(80)=0
We add all the numbers together, and all the variables
4(b+10)-80=0
We multiply parentheses
4b+40-80=0
We add all the numbers together, and all the variables
4b-40=0
We move all terms containing b to the left, all other terms to the right
4b=40
b=40/4
b=10
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