In this item, we equate the functions as stated.
f(x) = g(x)
3x - 23 = -4.5x + 7
Transpose all the terms with variables to one side of the equation and all the constants to the other side. This is shown below.
3x + 4.5x = 7 + 23
Combine like terms,
7.5x = 30
Divide both sides of the equation by 7.5.
(7.5x)/7.5 = 30/(7.5)
x = 4
Therefore, the solution to this item is that x = 4.