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30(12+b)=1110
We move all terms to the left:
30(12+b)-(1110)=0
We add all the numbers together, and all the variables
30(b+12)-1110=0
We multiply parentheses
30b+360-1110=0
We add all the numbers together, and all the variables
30b-750=0
We move all terms containing b to the left, all other terms to the right
30b=750
b=750/30
b=25
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