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Normal
Both angles together 90°So(9x + 5) + (3x + 1) = 9012x + 6 = 9012x = 8412x/12 = 84/12x = 7
Both angles together 90°
So
(9x + 5) + (3x + 1) = 90
12x + 6 = 90
12x = 84
12x/12 = 84/12
x = 7
