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4(7-x)=12.
We move all terms to the left:
4(7-x)-(12.)=0
We add all the numbers together, and all the variables
4(-1x+7)-12=0
We multiply parentheses
-4x+28-12=0
We add all the numbers together, and all the variables
-4x+16=0
We move all terms containing x to the left, all other terms to the right
-4x=-16
x=-16/-4
x=+4
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