Question 895301
I hope you tried it first before sending it here.

let x be the angle
let 90 - x be the complement

x = 6 + (90 - x)

90 = 6 + (90 -x) + 90 - x
90 = 6 + 90 +90 - x - x
90 = 186 - 2x
90 - 186 = - 2x
- 96 = - 2x
48 = x

90 - x = 42

the measure of the complement is 42