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x-(x*0.2)=3
We move all terms to the left:
x-(x*0.2)-(3)=0
We add all the numbers together, and all the variables
x-(+x*0.2)-3=0
We get rid of parentheses
x-x*0.2-3=0
Wy multiply elements
x-0.2x-3=0
We add all the numbers together, and all the variables
0.8x-3=0
We move all terms containing x to the left, all other terms to the right
0.8x=3
x=3/0.8
x=3+0.6/0.8
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