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3(4x+1)=57
We move all terms to the left:
3(4x+1)-(57)=0
We multiply parentheses
12x+3-57=0
We add all the numbers together, and all the variables
12x-54=0
We move all terms containing x to the left, all other terms to the right
12x=54
x=54/12
x=4+1/2
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