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100=12b-3
We move all terms to the left:
100-(12b-3)=0
We get rid of parentheses
-12b+3+100=0
We add all the numbers together, and all the variables
-12b+103=0
We move all terms containing b to the left, all other terms to the right
-12b=-103
b=-103/-12
b=8+7/12
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