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3(4-x)-(12+x)=4
We move all terms to the left:
3(4-x)-(12+x)-(4)=0
We add all the numbers together, and all the variables
3(-1x+4)-(x+12)-4=0
We multiply parentheses
-3x-(x+12)+12-4=0
We get rid of parentheses
-3x-x-12+12-4=0
We add all the numbers together, and all the variables
-4x-4=0
We move all terms containing x to the left, all other terms to the right
-4x=4
x=4/-4
x=-1
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