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.05x+.02(12000-x)=480
We move all terms to the left:
.05x+.02(12000-x)-(480)=0
We add all the numbers together, and all the variables
.05x+.02(-1x+12000)-480=0
We multiply parentheses
.05x-0.02x+240-480=0
We add all the numbers together, and all the variables
0.03x-240=0
We move all terms containing x to the left, all other terms to the right
0.03x=240
x=240/0.03
x=8000
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