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5(a-1)-3(a-3)=20.
We move all terms to the left:
5(a-1)-3(a-3)-(20.)=0
We add all the numbers together, and all the variables
5(a-1)-3(a-3)-20=0
We multiply parentheses
5a-3a-5+9-20=0
We add all the numbers together, and all the variables
2a-16=0
We move all terms containing a to the left, all other terms to the right
2a=16
a=16/2
a=8
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