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8b+(-18b)=20
We move all terms to the left:
8b+(-18b)-(20)=0
We get rid of parentheses
8b-18b-20=0
We add all the numbers together, and all the variables
-10b-20=0
We move all terms containing b to the left, all other terms to the right
-10b=20
b=20/-10
b=-2
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