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x-(x*0.2)=4500
We move all terms to the left:
x-(x*0.2)-(4500)=0
We add all the numbers together, and all the variables
x-(+x*0.2)-4500=0
We get rid of parentheses
x-x*0.2-4500=0
Wy multiply elements
x-0.2x-4500=0
We add all the numbers together, and all the variables
0.8x-4500=0
We move all terms containing x to the left, all other terms to the right
0.8x=4500
x=4500/0.8
x=5625
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