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8(2b-40)=-144
We move all terms to the left:
8(2b-40)-(-144)=0
We add all the numbers together, and all the variables
8(2b-40)+144=0
We multiply parentheses
16b-320+144=0
We add all the numbers together, and all the variables
16b-176=0
We move all terms containing b to the left, all other terms to the right
16b=176
b=176/16
b=11
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