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5x-4x=4x+12
We move all terms to the left:
5x-4x-(4x+12)=0
We add all the numbers together, and all the variables
x-(4x+12)=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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