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2x+4x=21-9
We move all terms to the left:
2x+4x-(21-9)=0
We add all the numbers together, and all the variables
2x+4x-12=0
We add all the numbers together, and all the variables
6x-12=0
We move all terms containing x to the left, all other terms to the right
6x=12
x=12/6
x=2
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