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45=4b+13=b=
We move all terms to the left:
45-(4b+13)=0
We get rid of parentheses
-4b-13+45=0
We add all the numbers together, and all the variables
-4b+32=0
We move all terms containing b to the left, all other terms to the right
-4b=-32
b=-32/-4
b=+8
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