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0.04x+0.06(10.000-x)=400
We move all terms to the left:
0.04x+0.06(10.000-x)-(400)=0
We add all the numbers together, and all the variables
0.04x+0.06(-1x+10)-400=0
We multiply parentheses
0.04x-0.06x+0.6-400=0
We add all the numbers together, and all the variables
-0.02x-399.4=0
We move all terms containing x to the left, all other terms to the right
-0.02x=399.4
x=399.4/-0.02
x=-19970+-5.68434188608E-14/0.02
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