Answer:
x=9, x>-9, x=7
Step-by-step explanation:
[tex]15x + 121 = 256 \\ 15x = 256 - 121 \\ 15x = 135 \\ \frac{15x}{15} = \frac{135}{15} \\ x = 9[/tex]
[tex]4x + 8 > 2x - 10 \\ 4x - 2x > - 10 - 8 \\ 2x = - 18 \\ \frac{2x}{2} = \frac{ - 18}{2} \\ x > - 9[/tex]
[tex]5x + 7 = 42 \\ 5x = 42 - 7 \\ 5x = 35 \\ \frac{5x}{5} = \frac{35}{5} \\ x = 7[/tex]
