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85-8b=-4b+69
We move all terms to the left:
85-8b-(-4b+69)=0
We get rid of parentheses
-8b+4b-69+85=0
We add all the numbers together, and all the variables
-4b+16=0
We move all terms containing b to the left, all other terms to the right
-4b=-16
b=-16/-4
b=+4
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