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2x+(-2x-7)=-7
We move all terms to the left:
2x+(-2x-7)-(-7)=0
We add all the numbers together, and all the variables
2x+(-2x-7)+7=0
We get rid of parentheses
2x-2x-7+7=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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