Afunction f is defined by f: x=3-2sinx for 0

       f(x) = 3 - 2sin(x)
          0 = 3 - 2sin(x)
        - 3  - 3
         -3 = -2sin(x)
         -2        -2
        1¹/₂ = sin(x)
sin⁻¹(1¹/₂) = sin⁻¹[sin(x)]
sin⁻¹(1¹/₂) = x

You can combine like/similar terms if the number has the same x at the end, or if the like terms are all regular numbers.
Since 16x and -4x both have an x, you can combine them like you usually would.
16x - 4x = 12x
12x = -48
If you want to solve the equation, you’d divide both numbers by 12 to get your singular x value.
x = -4

Hope that helped! :)