The last two are correct.
x = 9.9
How? Well, let's break it down simply.
Your initial equation was x = 0.6 + 9.3.
First, we simplify both sides of the equation, and combine like terms.
0.6 + 9.3 = 9.9
Thus, x = 9.9.
Esinhower accepted most of his foreign policy but esinhower got the last say