( 21 + ( n - 1 ) ( 4 ) < 0
Solve for n
n<-\frac{17}{4}
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21+4n-4<0
Use the distributive property to multiply n-1 by 4.
17+4n<0
Subtract 4 from 21 to get 17.
4n<-17
Subtract 17 from both sides. Anything subtracted from zero gives its negation.
n<-\frac{17}{4}
Divide both sides by 4. Since 4 is positive, the inequality direction remains the same.
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