Question

-28 ≤ -5t + -3 ≤ -18

Answer 1

-28 <= -5t - 3 <= -18 --- add 3
3 - 28 <= -5t - 3 + 3 <= -18 + 3 -- combine like terms
-25 <= -5t <= - 15 --- divide by -5, and change the inequality signs
-25/-5 >= -5t/-5 >= -15/-5
5 >= t >= 3

any questions ?

Answer 2

|-2x + 3| = 15

Answer 3

| -2x + 3| = 15

(-2x + 3) = 15
-2x = 15 - 3
-2x = 12
x = -6

-(-2x + 3) = 15
2x - 3 = 15
2x = 15 + 3
2x = 18
x = 9

solution : x = -6 and x = 9