Question

2.6 + x = 10.4 What is x?

Answer 1

Answer:

x = 7.8

Step-by-step explanation:

2.6 + x = 10.4

-2.6            -2.6

          x = 7.8

You do the inverse operations to find out x

Answer 2

Answer:

x = 7.8

Step-by-step explanation:

$2.6+x=10.4\\\\2.6-2.6+x=10.4-2.6\\\\\boxed{x=7.8}$

Hope this helps.