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13=4b+3-2b
We move all terms to the left:
13-(4b+3-2b)=0
We add all the numbers together, and all the variables
-(2b+3)+13=0
We get rid of parentheses
-2b-3+13=0
We add all the numbers together, and all the variables
-2b+10=0
We move all terms containing b to the left, all other terms to the right
-2b=-10
b=-10/-2
b=+5
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