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0.08x+0.09(9.000-x)=500
We move all terms to the left:
0.08x+0.09(9.000-x)-(500)=0
We add all the numbers together, and all the variables
0.08x+0.09(-1x+9)-500=0
We multiply parentheses
0.08x-0.09x+0.81-500=0
We add all the numbers together, and all the variables
-0.01x-499.19=0
We move all terms containing x to the left, all other terms to the right
-0.01x=499.19
x=499.19/-0.01
x=-49919
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