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4(9+3x)=108
We move all terms to the left:
4(9+3x)-(108)=0
We add all the numbers together, and all the variables
4(3x+9)-108=0
We multiply parentheses
12x+36-108=0
We add all the numbers together, and all the variables
12x-72=0
We move all terms containing x to the left, all other terms to the right
12x=72
x=72/12
x=6
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