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x-(x*0.9)=10000
We move all terms to the left:
x-(x*0.9)-(10000)=0
We add all the numbers together, and all the variables
x-(+x*0.9)-10000=0
We get rid of parentheses
x-x*0.9-10000=0
Wy multiply elements
x-0.9x-10000=0
We add all the numbers together, and all the variables
0.1x-10000=0
We move all terms containing x to the left, all other terms to the right
0.1x=10000
x=10000/0.1
x=100000
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