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90=24+2b
We move all terms to the left:
90-(24+2b)=0
We add all the numbers together, and all the variables
-(2b+24)+90=0
We get rid of parentheses
-2b-24+90=0
We add all the numbers together, and all the variables
-2b+66=0
We move all terms containing b to the left, all other terms to the right
-2b=-66
b=-66/-2
b=+33
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