How do you solve -4abs(8-5n)-7=13?

Jul 7, 2015

$n \setminus \in \setminus \emptyset$

Explanation:

Let's isolate the modulus.

$- 4 | 8 - 5 n | = 20$

$| 8 - 5 n | = - 5 = | y |$

Is there a number y, whose modulus is negative?