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x+(0.8x)=42000
We move all terms to the left:
x+(0.8x)-(42000)=0
We add all the numbers together, and all the variables
x+(+0.8x)-42000=0
We get rid of parentheses
x+0.8x-42000=0
We add all the numbers together, and all the variables
1.8x-42000=0
We move all terms containing x to the left, all other terms to the right
1.8x=42000
x=42000/1.8
x=23333+0.59999999999854/1.8
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