-3/4 times what gets -1
Let the unknown number be x:
(-3/4)·x = -1 To remove the -3/4, since it is times x, divide by -3/4:
(-3/4)·x ÷ (-3/4) = -1 ÷ (-3/4)
x = 4/3
Note: -1 ÷ (-3/4) = -1 x (4/-3) = 4/3