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X-(X*0.2)=12
We move all terms to the left:
X-(X*0.2)-(12)=0
We add all the numbers together, and all the variables
X-(+X*0.2)-12=0
We get rid of parentheses
X-X*0.2-12=0
Wy multiply elements
X-0.2X-12=0
We add all the numbers together, and all the variables
0.8X-12=0
We move all terms containing X to the left, all other terms to the right
0.8X=12
X=12/0.8
X=15
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