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.03x+.15(x+8000)=1920
We move all terms to the left:
.03x+.15(x+8000)-(1920)=0
We multiply parentheses
.03x+0.15x+1200-1920=0
We add all the numbers together, and all the variables
0.18x-720=0
We move all terms containing x to the left, all other terms to the right
0.18x=720
x=720/0.18
x=4000
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