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-4(2b+3b)=-104
We move all terms to the left:
-4(2b+3b)-(-104)=0
We add all the numbers together, and all the variables
-4(+5b)-(-104)=0
We add all the numbers together, and all the variables
-4(+5b)+104=0
We multiply parentheses
-20b+104=0
We move all terms containing b to the left, all other terms to the right
-20b=-104
b=-104/-20
b=5+1/5
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