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2x-6=3x+9+4x
We move all terms to the left:
2x-6-(3x+9+4x)=0
We add all the numbers together, and all the variables
2x-(7x+9)-6=0
We get rid of parentheses
2x-7x-9-6=0
We add all the numbers together, and all the variables
-5x-15=0
We move all terms containing x to the left, all other terms to the right
-5x=15
x=15/-5
x=-3
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