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0.04+0.09(1000-x)=800
We move all terms to the left:
0.04+0.09(1000-x)-(800)=0
We add all the numbers together, and all the variables
0.09(-1x+1000)+0.04-800=0
We add all the numbers together, and all the variables
0.09(-1x+1000)-799.96=0
We multiply parentheses
-0.09x+90-799.96=0
We add all the numbers together, and all the variables
-0.09x-709.96=0
We move all terms containing x to the left, all other terms to the right
-0.09x=709.96
x=709.96/-0.09
x=-7888+0.0400000000001/0.09
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