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800=9x-100
We move all terms to the left:
800-(9x-100)=0
We get rid of parentheses
-9x+100+800=0
We add all the numbers together, and all the variables
-9x+900=0
We move all terms containing x to the left, all other terms to the right
-9x=-900
x=-900/-9
x=+100
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