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6(12+x)=144
We move all terms to the left:
6(12+x)-(144)=0
We add all the numbers together, and all the variables
6(x+12)-144=0
We multiply parentheses
6x+72-144=0
We add all the numbers together, and all the variables
6x-72=0
We move all terms containing x to the left, all other terms to the right
6x=72
x=72/6
x=12
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