Answer:
(4n - 2) + 90 + (3n + 8) = 180
4n - 2 + 90 + 3n + 8 = 180.
7n + 96 = 180
7n = 180 - 96
7n = 84
n = 84/7
•°• n = 12
4n - 2 + 90 + 3n + 8 = 180
n = 12
x=-9/a and a=-9/x
Step-by-step explanation: