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12+4x-8+5x=12x+4
We move all terms to the left:
12+4x-8+5x-(12x+4)=0
We add all the numbers together, and all the variables
9x-(12x+4)+4=0
We get rid of parentheses
9x-12x-4+4=0
We add all the numbers together, and all the variables
-3x=0
x=0/-3
x=0
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