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.15x+.05(50000-x)=9000
We move all terms to the left:
.15x+.05(50000-x)-(9000)=0
We add all the numbers together, and all the variables
.15x+.05(-1x+50000)-9000=0
We multiply parentheses
.15x-0.05x+2500-9000=0
We add all the numbers together, and all the variables
0.1x-6500=0
We move all terms containing x to the left, all other terms to the right
0.1x=6500
x=6500/0.1
x=65000
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