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9=8-2x
We move all terms to the left:
9-(8-2x)=0
We add all the numbers together, and all the variables
-(-2x+8)+9=0
We get rid of parentheses
2x-8+9=0
We add all the numbers together, and all the variables
2x+1=0
We move all terms containing x to the left, all other terms to the right
2x=-1
x=-1/2
x=-1/2
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