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7=99+x
We move all terms to the left:
7-(99+x)=0
We add all the numbers together, and all the variables
-(x+99)+7=0
We get rid of parentheses
-x-99+7=0
We add all the numbers together, and all the variables
-1x-92=0
We move all terms containing x to the left, all other terms to the right
-x=92
x=92/-1
x=-92
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