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7b=18-3b
We move all terms to the left:
7b-(18-3b)=0
We add all the numbers together, and all the variables
7b-(-3b+18)=0
We get rid of parentheses
7b+3b-18=0
We add all the numbers together, and all the variables
10b-18=0
We move all terms containing b to the left, all other terms to the right
10b=18
b=18/10
b=1+4/5
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