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x+0.3x=30000
We move all terms to the left:
x+0.3x-(30000)=0
We add all the numbers together, and all the variables
1.3x-30000=0
We move all terms containing x to the left, all other terms to the right
1.3x=30000
x=30000/1.3
x=23076+1/1.0833333333327
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