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X+6X+(X+100)=804
We move all terms to the left:
X+6X+(X+100)-(804)=0
We add all the numbers together, and all the variables
7X+(X+100)-804=0
We get rid of parentheses
7X+X+100-804=0
We add all the numbers together, and all the variables
8X-704=0
We move all terms containing X to the left, all other terms to the right
8X=704
X=704/8
X=88
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