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16b+12b=4b+72
We move all terms to the left:
16b+12b-(4b+72)=0
We add all the numbers together, and all the variables
28b-(4b+72)=0
We get rid of parentheses
28b-4b-72=0
We add all the numbers together, and all the variables
24b-72=0
We move all terms containing b to the left, all other terms to the right
24b=72
b=72/24
b=3
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