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0.9+0.1(x-20000)=6800
We move all terms to the left:
0.9+0.1(x-20000)-(6800)=0
We add all the numbers together, and all the variables
0.1(x-20000)-6799.1=0
We multiply parentheses
0.1x-2000-6799.1=0
We add all the numbers together, and all the variables
0.1x-8799.1=0
We move all terms containing x to the left, all other terms to the right
0.1x=8799.1
x=8799.1/0.1
x=87991
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