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(99-x)=(66-16)
We move all terms to the left:
(99-x)-((66-16))=0
We add all the numbers together, and all the variables
(-1x+99)-(50)=0
We add all the numbers together, and all the variables
(-1x+99)-50=0
We get rid of parentheses
-1x+99-50=0
We add all the numbers together, and all the variables
-1x+49=0
We move all terms containing x to the left, all other terms to the right
-x=-49
x=-49/-1
x=+49
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