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800=100+100+100x
We move all terms to the left:
800-(100+100+100x)=0
We add all the numbers together, and all the variables
-(100x+200)+800=0
We get rid of parentheses
-100x-200+800=0
We add all the numbers together, and all the variables
-100x+600=0
We move all terms containing x to the left, all other terms to the right
-100x=-600
x=-600/-100
x=+6
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