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-7-(-x)=-12
We move all terms to the left:
-7-(-x)-(-12)=0
We add all the numbers together, and all the variables
-(-1x)-7-(-12)=0
We add all the numbers together, and all the variables
-(-1x)+5=0
We get rid of parentheses
1x+5=0
We add all the numbers together, and all the variables
x+5=0
We move all terms containing x to the left, all other terms to the right
x=-5
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