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45b-45=5b-25
We move all terms to the left:
45b-45-(5b-25)=0
We get rid of parentheses
45b-5b+25-45=0
We add all the numbers together, and all the variables
40b-20=0
We move all terms containing b to the left, all other terms to the right
40b=20
b=20/40
b=1/2
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