Question 64990
I am to use interval notation for the solution set: 
Please help 
3x+9=3(x-3)
3x+9=3x-9
9=-9
Answer: the null set
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Here is another one:
3x<9 and 2x+1>3 
x<3 and 2x>2
x<3 and x>2
(-inf,3)and(2,inf)
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Cheers,
Stan H.