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-5(9+9)=x
We move all terms to the left:
-5(9+9)-(x)=0
We add all the numbers together, and all the variables
-x-518=0
We add all the numbers together, and all the variables
-1x-518=0
We move all terms containing x to the left, all other terms to the right
-x=518
x=518/-1
x=-518
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