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x+.4x=3000
We move all terms to the left:
x+.4x-(3000)=0
We add all the numbers together, and all the variables
1.4x-3000=0
We move all terms containing x to the left, all other terms to the right
1.4x=3000
x=3000/1.4
x=2142+1/1.1666666666664
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