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3(12-x)=4
We move all terms to the left:
3(12-x)-(4)=0
We add all the numbers together, and all the variables
3(-1x+12)-4=0
We multiply parentheses
-3x+36-4=0
We add all the numbers together, and all the variables
-3x+32=0
We move all terms containing x to the left, all other terms to the right
-3x=-32
x=-32/-3
x=10+2/3
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