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100-x=x*0.4
We move all terms to the left:
100-x-(x*0.4)=0
We add all the numbers together, and all the variables
-x-(+x*0.4)+100=0
We add all the numbers together, and all the variables
-1x-(+x*0.4)+100=0
We get rid of parentheses
-1x-x*0.4+100=0
Wy multiply elements
-1x-0.4x+100=0
We add all the numbers together, and all the variables
-1.4x+100=0
We move all terms containing x to the left, all other terms to the right
-1.4x=-100
x=-100/-1.4
x=71+0.6/1.4
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