5.
4x-6 = 90
4x = 84
x = 21 degrees
6.
The sum of all 3 angles in that triangle = 180.
We know that the right angle = 90.
So the other 2 angles = 90.
(2x+53) + (5x+2) = 90
Combine like terms
7x + 55 = 90
7x = 35
x = 5 degrees
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