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19b-18b+3b-4b+2b=20
We move all terms to the left:
19b-18b+3b-4b+2b-(20)=0
We add all the numbers together, and all the variables
2b-20=0
We move all terms containing b to the left, all other terms to the right
2b=20
b=20/2
b=10
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