Answer:
x = 11
Explanation:
The sum of the 3 angles in a triangle = 180°
Sum the 3 given angles and equate to 180
3x + 4 + 5x - 2 + 90 = 180
8x + 92 = 180 ( subtract 92 from both sides )
8x = 88 ( divide both sides by 8 )
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