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.04(x)+.06(2x)=800
We move all terms to the left:
.04(x)+.06(2x)-(800)=0
We add all the numbers together, and all the variables
0.102x-800=0
We move all terms containing x to the left, all other terms to the right
0.102x=800
x=800/0.102
x=7843+0.01400000000001/0.102
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