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25=45-b
We move all terms to the left:
25-(45-b)=0
We add all the numbers together, and all the variables
-(-1b+45)+25=0
We get rid of parentheses
1b-45+25=0
We add all the numbers together, and all the variables
b-20=0
We move all terms containing b to the left, all other terms to the right
b=20
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