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5\left(a+4\right)+2\left(13-4a\right)<0
Multiply both sides of the equation by 10, the least common multiple of 2,5. Since 10 is positive, the inequality direction remains the same.
5a+20+2\left(13-4a\right)<0
Use the distributive property to multiply 5 by a+4.
5a+20+26-8a<0
Use the distributive property to multiply 2 by 13-4a.
5a+46-8a<0
Add 20 and 26 to get 46.
-3a+46<0
Combine 5a and -8a to get -3a.
-3a<-46
Subtract 46 from both sides. Anything subtracted from zero gives its negation.
a>\frac{-46}{-3}
Divide both sides by -3. Since -3 is negative, the inequality direction is changed.
a>\frac{46}{3}
Fraction \frac{-46}{-3} can be simplified to \frac{46}{3} by removing the negative sign from both the numerator and the denominator.