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x+4=3x+4.
We move all terms to the left:
x+4-(3x+4.)=0
We add all the numbers together, and all the variables
x-(3x+4)+4=0
We get rid of parentheses
x-3x-4+4=0
We add all the numbers together, and all the variables
-2x=0
x=0/-2
x=0
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