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X=21+0.16X
We move all terms to the left:
X-(21+0.16X)=0
We add all the numbers together, and all the variables
X-(0.16X+21)=0
We get rid of parentheses
X-0.16X-21=0
We add all the numbers together, and all the variables
0.84X-21=0
We move all terms containing X to the left, all other terms to the right
0.84X=21
X=21/0.84
X=25
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