Question

What is 1.2+d+0.4=9.7?

Answer 1

1.2 + d + 0.4 = 9.7

1.6 + d = 9.7

1.6 (-1.6) + d = 9.7 (-1.6)

d = 8.1

your answer is 8.1

hope this helps

Answer 2

Since your solving for d, its actually quite simple to figure out.

First:

9.7 = 1.2 + d + 0.4

Add 1.2 and 0.4 together to get 1.6

1.2 + 0.4 = 1.6

Then, subtract 1.6 from 9.7

9.7 - 1.6 = 8.1

Finally, fill in the blank for d

1.2 + 8.1 + 0.4 = 9.7

so,  d = 8.1

Hope that helps you!