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20b+18-8b=-9(-3+18)
We move all terms to the left:
20b+18-8b-(-9(-3+18))=0
We add all the numbers together, and all the variables
20b-8b+18-(-915)=0
We add all the numbers together, and all the variables
12b+933=0
We move all terms containing b to the left, all other terms to the right
12b=-933
b=-933/12
b=-77+3/4
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