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12b+10(4b+1)=218
We move all terms to the left:
12b+10(4b+1)-(218)=0
We multiply parentheses
12b+40b+10-218=0
We add all the numbers together, and all the variables
52b-208=0
We move all terms containing b to the left, all other terms to the right
52b=208
b=208/52
b=4
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