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x-(x*0.15)=20000
We move all terms to the left:
x-(x*0.15)-(20000)=0
We add all the numbers together, and all the variables
x-(+x*0.15)-20000=0
We get rid of parentheses
x-x*0.15-20000=0
Wy multiply elements
x-0.15x-20000=0
We add all the numbers together, and all the variables
0.85x-20000=0
We move all terms containing x to the left, all other terms to the right
0.85x=20000
x=20000/0.85
x=23529+0.350000000002/0.85
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