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0.04x+0.03(14000-x)=420
We move all terms to the left:
0.04x+0.03(14000-x)-(420)=0
We add all the numbers together, and all the variables
0.04x+0.03(-1x+14000)-420=0
We multiply parentheses
0.04x-0.03x+420-420=0
We add all the numbers together, and all the variables
0.01x=0
x=0/0.01
x=0
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