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6x+3(2x+4)=54
We move all terms to the left:
6x+3(2x+4)-(54)=0
We multiply parentheses
6x+6x+12-54=0
We add all the numbers together, and all the variables
12x-42=0
We move all terms containing x to the left, all other terms to the right
12x=42
x=42/12
x=3+1/2
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