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