Question 209173
Let(90 - y) = the complement of y.

y = 6 + 3(90 - y)....This is your equation.  We can now solve for y using algebra.

y = 6 + 270 - 3y

y = 276 - 3y

y + 3y = 276

4y = 276

y = 276/4

y = 69