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2x+4x-9=12+6
We move all terms to the left:
2x+4x-9-(12+6)=0
We add all the numbers together, and all the variables
2x+4x-9-18=0
We add all the numbers together, and all the variables
6x-27=0
We move all terms containing x to the left, all other terms to the right
6x=27
x=27/6
x=4+1/2
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