Use inverse operations to solve x - 5.6 = -1.7

The inverse operation of subtraction is addition. Lets use the inverse operation to solve x. Lets do it:-

x - 5.6 = -1.7
-1.7 + 5.6 = x
-1.7 + 5.6 = 3.9 
x = 3.9

CHECK OUR WORK:-

3.9 - 5.6 = -1.7
We were RIGHT!!

So, x = 3.9.

Hope I helped ya!! 

X - 5.6 = -1.7

We are subtracting 5.6, and the to undo the subtraction we must do addition. So add 5.6 on both sides

x - 5.6 + 5.6 = -1.7 + 5.6

Simplify it

x = -1.7 + 5.6

This can also be rearranged to become

x = 5.6 - 1.7

Finally, do the subtraction and you get

x = 3.9