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5x+x=12-x+x
We move all terms to the left:
5x+x-(12-x+x)=0
We add all the numbers together, and all the variables
5x+x-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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