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10-x=x-9
We move all terms to the left:
10-x-(x-9)=0
We add all the numbers together, and all the variables
-1x-(x-9)+10=0
We get rid of parentheses
-1x-x+9+10=0
We add all the numbers together, and all the variables
-2x+19=0
We move all terms containing x to the left, all other terms to the right
-2x=-19
x=-19/-2
x=9+1/2
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