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78.45+12.87-x+10.67=208.56-89.23
We move all terms to the left:
78.45+12.87-x+10.67-(208.56-89.23)=0
We add all the numbers together, and all the variables
-x+78.45+12.87+10.67-(119.33)=0
We add all the numbers together, and all the variables
-1x-17.34=0
We move all terms containing x to the left, all other terms to the right
-x=17.34
x=17.34/-1
x=-17+0.34/1
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