Question

What is the solution to the equation x + 2.15 = –3.2?

Answer 1

So, first we have to isolate x. 

x+2.15=-3.2
  -2.15   -2.15   Subtract 2.15 from both sides.
x= -5.35

Hope this helps ;)

Answer 2

X = -5.35

Sorry if I'm wrong