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x+.3x=20000
We move all terms to the left:
x+.3x-(20000)=0
We add all the numbers together, and all the variables
1.3x-20000=0
We move all terms containing x to the left, all other terms to the right
1.3x=20000
x=20000/1.3
x=15384+0.79999999999927/1.3
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