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0.4x+x=20000
We move all terms to the left:
0.4x+x-(20000)=0
We add all the numbers together, and all the variables
1.4x-20000=0
We move all terms containing x to the left, all other terms to the right
1.4x=20000
x=20000/1.4
x=14285+1/1.4
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