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-(x+3-x)=2x+7
We move all terms to the left:
-(x+3-x)-(2x+7)=0
We add all the numbers together, and all the variables
-(2x+7)-3=0
We get rid of parentheses
-2x-7-3=0
We add all the numbers together, and all the variables
-2x-10=0
We move all terms containing x to the left, all other terms to the right
-2x=10
x=10/-2
x=-5
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