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100-(-x)=50
We move all terms to the left:
100-(-x)-(50)=0
We add all the numbers together, and all the variables
-(-1x)+100-50=0
We add all the numbers together, and all the variables
-(-1x)+50=0
We get rid of parentheses
1x+50=0
We add all the numbers together, and all the variables
x+50=0
We move all terms containing x to the left, all other terms to the right
x=-50
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