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x.x.x-x.x+7x=20
We move all terms to the left:
x.x.x-x.x+7x-(20)=0
We add all the numbers together, and all the variables
7x+x.x.x-x.x-20=0
We move all terms containing x to the left, all other terms to the right
7x+x.x.x-x.x=20
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