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3(4x+3)=31
We move all terms to the left:
3(4x+3)-(31)=0
We multiply parentheses
12x+9-31=0
We add all the numbers together, and all the variables
12x-22=0
We move all terms containing x to the left, all other terms to the right
12x=22
x=22/12
x=1+5/6
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