Question 90072
Solve the inequality 21/15-3x<0 and express the solution as an interval.
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Since 21 is positive 
the fraction will be <0 when 15-3x is negative:
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Solve 15-3x < 0
3x > 15 
x > 5
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So the inequality will be true as long as x > 5
Interval Answer: (5,inf)

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Cheers,
stan H.