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(x+6)+(12-4x)=0.
We add all the numbers together, and all the variables
(x+6)+(-4x+12)=0
We get rid of parentheses
x-4x+6+12=0
We add all the numbers together, and all the variables
-3x+18=0
We move all terms containing x to the left, all other terms to the right
-3x=-18
x=-18/-3
x=+6
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