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-4(9-x)=12
We move all terms to the left:
-4(9-x)-(12)=0
We add all the numbers together, and all the variables
-4(-1x+9)-12=0
We multiply parentheses
4x-36-12=0
We add all the numbers together, and all the variables
4x-48=0
We move all terms containing x to the left, all other terms to the right
4x=48
x=48/4
x=12
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