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35=x+x
We move all terms to the left:
35-(x+x)=0
We add all the numbers together, and all the variables
-(+2x)+35=0
We get rid of parentheses
-2x+35=0
We move all terms containing x to the left, all other terms to the right
-2x=-35
x=-35/-2
x=17+1/2
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