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400+0.06x=500+0.04x
We move all terms to the left:
400+0.06x-(500+0.04x)=0
We add all the numbers together, and all the variables
0.06x-(0.04x+500)+400=0
We get rid of parentheses
0.06x-0.04x-500+400=0
We add all the numbers together, and all the variables
0.02x-100=0
We move all terms containing x to the left, all other terms to the right
0.02x=100
x=100/0.02
x=5000
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