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18=b-7+3b
We move all terms to the left:
18-(b-7+3b)=0
We add all the numbers together, and all the variables
-(4b-7)+18=0
We get rid of parentheses
-4b+7+18=0
We add all the numbers together, and all the variables
-4b+25=0
We move all terms containing b to the left, all other terms to the right
-4b=-25
b=-25/-4
b=6+1/4
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