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3(5x+1)-20=12x+1
We move all terms to the left:
3(5x+1)-20-(12x+1)=0
We multiply parentheses
15x-(12x+1)+3-20=0
We get rid of parentheses
15x-12x-1+3-20=0
We add all the numbers together, and all the variables
3x-18=0
We move all terms containing x to the left, all other terms to the right
3x=18
x=18/3
x=6
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