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-20=-4b-6b
We move all terms to the left:
-20-(-4b-6b)=0
We add all the numbers together, and all the variables
-(-10b)-20=0
We get rid of parentheses
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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