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3(10x+50)=390
We move all terms to the left:
3(10x+50)-(390)=0
We multiply parentheses
30x+150-390=0
We add all the numbers together, and all the variables
30x-240=0
We move all terms containing x to the left, all other terms to the right
30x=240
x=240/30
x=8
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