500x+1000(175-x)=100000
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500x+1000(175-x)=100000
1000(175-x)=100000-500x
175000-1000x=100000-500x
175000=100000-500x+1000x
175000=100000+500x
175000-100000=500x
500x=175000-100000
500x=75000
x=75000/500
x=750/5
x=150
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