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-8b+2(-5b-2)=50
We move all terms to the left:
-8b+2(-5b-2)-(50)=0
We multiply parentheses
-8b-10b-4-50=0
We add all the numbers together, and all the variables
-18b-54=0
We move all terms containing b to the left, all other terms to the right
-18b=54
b=54/-18
b=-3
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