Question 61778
4 + 3 |5n + 1| = 13

Subtract 4 from both sides: 3 |5n + 1| = 9

Divide both sides by 3: |5n + 1| = 3

So, 5n+1 = 3 or 5n + 1 = -3

If 5n+1 = 3 then 5n=2 and n = 2/5
If 5n+1 = -3 then 5n=-4 and n = -4/5


5 - 4 |2-3t| = 21
Subtract 5 from both sides: -4 |2 - 3t| = 16
Divide both sides by -4: |2 - 3t| = -4
There's no solution because |2 - 3t|, by definition must be >= 0. It can never be -4.