How to solve the equation 15.3-x + 1.2x = 11.5?

How to solve the equation 15.3-x + 1.2x = 11.5?

15.3-X+1.2X=11.5
15.3+0.2X=11.5
0.2X=11.5-15.3
0.2X=-3.8
X=-3.8/0.2
X=-1.9