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5(5-b)=45
We move all terms to the left:
5(5-b)-(45)=0
We add all the numbers together, and all the variables
5(-1b+5)-45=0
We multiply parentheses
-5b+25-45=0
We add all the numbers together, and all the variables
-5b-20=0
We move all terms containing b to the left, all other terms to the right
-5b=20
b=20/-5
b=-4
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