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Answer:
x = 8
Step-by-step explanation:
The 3 angles lie on a straight line and sum to 180°
sum the 3 angles and equate to 180
6x + 4 + 90 + 5x - 2 = 180 , that is
11x + 92 = 180 ( subtract 92 from both sides )
11x = 88 ( divide both sides by 11 )
x = 8