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3(3x+x)=144
We move all terms to the left:
3(3x+x)-(144)=0
We add all the numbers together, and all the variables
3(+4x)-144=0
We multiply parentheses
12x-144=0
We move all terms containing x to the left, all other terms to the right
12x=144
x=144/12
x=12
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