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0.45x+0.30(280-x)=93
We move all terms to the left:
0.45x+0.30(280-x)-(93)=0
We add all the numbers together, and all the variables
0.45x+0.30(-1x+280)-93=0
We multiply parentheses
0.45x-0.3x+84-93=0
We add all the numbers together, and all the variables
0.15x-9=0
We move all terms containing x to the left, all other terms to the right
0.15x=9
x=9/0.15
x=60
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