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