The sum of two integers is 43. If one of them is -27, find the other.

Let the two integers be x and y.

Given that x + y = 43 and x = -27.

Substitute x in the below equation

x + y = 43
-27 + y = 23 $\hspace{1cm}$(Substituting x)
y = 23 + 27 $\hspace{1.1cm}$(Solve for y)
y = 23 + 27
y = 70

∴ The other integer is 70