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18b-15=10b+105
We move all terms to the left:
18b-15-(10b+105)=0
We get rid of parentheses
18b-10b-105-15=0
We add all the numbers together, and all the variables
8b-120=0
We move all terms containing b to the left, all other terms to the right
8b=120
b=120/8
b=15
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