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12(2x+4)=144
We move all terms to the left:
12(2x+4)-(144)=0
We multiply parentheses
24x+48-144=0
We add all the numbers together, and all the variables
24x-96=0
We move all terms containing x to the left, all other terms to the right
24x=96
x=96/24
x=4
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