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9+99x=8+98x
We move all terms to the left:
9+99x-(8+98x)=0
We add all the numbers together, and all the variables
99x-(98x+8)+9=0
We get rid of parentheses
99x-98x-8+9=0
We add all the numbers together, and all the variables
x+1=0
We move all terms containing x to the left, all other terms to the right
x=-1
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