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68=20+3b
We move all terms to the left:
68-(20+3b)=0
We add all the numbers together, and all the variables
-(3b+20)+68=0
We get rid of parentheses
-3b-20+68=0
We add all the numbers together, and all the variables
-3b+48=0
We move all terms containing b to the left, all other terms to the right
-3b=-48
b=-48/-3
b=+16
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