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84+(0.3X)=X
We move all terms to the left:
84+(0.3X)-(X)=0
We add all the numbers together, and all the variables
(+0.3X)-X+84=0
We add all the numbers together, and all the variables
-1X+(+0.3X)+84=0
We get rid of parentheses
-1X+0.3X+84=0
We add all the numbers together, and all the variables
-0.7X+84=0
We move all terms containing X to the left, all other terms to the right
-0.7X=-84
X=-84/-0.7
X=+120
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