Resposta:

a)

[tex]2x + 9 = 45 \\ 2x = 36 \\ x = 18[/tex]

b)

[tex]x - 60 = 95 \\ x = 155[/tex]

c)

[tex]4x - 6 = 50 \\ 4x = 56 \\ x = 14[/tex]

d)

[tex]3x + 2x = 75 \\ 5x = 75 \\ x = 15[/tex]