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x+(x*0.18)=12000
We move all terms to the left:
x+(x*0.18)-(12000)=0
We add all the numbers together, and all the variables
x+(+x*0.18)-12000=0
We get rid of parentheses
x+x*0.18-12000=0
Wy multiply elements
x+0.18x-12000=0
We add all the numbers together, and all the variables
1.18x-12000=0
We move all terms containing x to the left, all other terms to the right
1.18x=12000
x=12000/1.18
x=10169+0.57999999999993/1.18
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