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5(a-9)=5a-45
We move all terms to the left:
5(a-9)-(5a-45)=0
We multiply parentheses
5a-(5a-45)-45=0
We get rid of parentheses
5a-5a+45-45=0
We add all the numbers together, and all the variables
=0
a=0/1
a=0
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