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21=17+b
We move all terms to the left:
21-(17+b)=0
We add all the numbers together, and all the variables
-(b+17)+21=0
We get rid of parentheses
-b-17+21=0
We add all the numbers together, and all the variables
-1b+4=0
We move all terms containing b to the left, all other terms to the right
-b=-4
b=-4/-1
b=+4
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