Solve for g.

g + (-5) = 27

g =

Solve for h.

-18 + h = 28

h =

Solve for a.

5.4 = a - (-1.8)

a =

g + (-5) = 27

⇒ g = 27 - (-5)

⇒ g = 27+5

⇒ g = 32

-18 + h = 28

⇒ h = 28 - (-18)

⇒ h = 28+18

⇒ h = 46

5.4 = a - (-1.8)

⇒ a = 5.4 + (-1.8)

⇒ a = 5.4 - 1.8

⇒ a = 3.6

For the first one you can add 5 on both sides so you gonna have : g - 5 = 27

+5 + 5

⇒ g = 27 + 5 = 32

for the second one you can add 18 on both sides : - 18 + h = 28

+18 + 18

⇒ h = 28 + 18 = 46

and as same in the last one : a = 3.6