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4*10^x=400.000
We move all terms to the left:
4*10^x-(400.000)=0
We add all the numbers together, and all the variables
4*10^x-400=0
Wy multiply elements
40x-400=0
We move all terms containing x to the left, all other terms to the right
40x=400
x=400/40
x=10
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