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5(a-8)+3=13
We move all terms to the left:
5(a-8)+3-(13)=0
We add all the numbers together, and all the variables
5(a-8)-10=0
We multiply parentheses
5a-40-10=0
We add all the numbers together, and all the variables
5a-50=0
We move all terms containing a to the left, all other terms to the right
5a=50
a=50/5
a=10
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