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100=x+.4x
We move all terms to the left:
100-(x+.4x)=0
We add all the numbers together, and all the variables
-(+1.4x)+100=0
We get rid of parentheses
-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+0.60000000000001/1.4
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