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3(5x+8)=69
We move all terms to the left:
3(5x+8)-(69)=0
We multiply parentheses
15x+24-69=0
We add all the numbers together, and all the variables
15x-45=0
We move all terms containing x to the left, all other terms to the right
15x=45
x=45/15
x=3
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