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84=10-x+84
We move all terms to the left:
84-(10-x+84)=0
We add all the numbers together, and all the variables
-(-1x+94)+84=0
We get rid of parentheses
1x-94+84=0
We add all the numbers together, and all the variables
x-10=0
We move all terms containing x to the left, all other terms to the right
x=10
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