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x-0.1x=38400
We move all terms to the left:
x-0.1x-(38400)=0
We add all the numbers together, and all the variables
0.9x-38400=0
We move all terms containing x to the left, all other terms to the right
0.9x=38400
x=38400/0.9
x=42666+0.59999999999854/0.9
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