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48=4b+72
We move all terms to the left:
48-(4b+72)=0
We get rid of parentheses
-4b-72+48=0
We add all the numbers together, and all the variables
-4b-24=0
We move all terms containing b to the left, all other terms to the right
-4b=24
b=24/-4
b=-6
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