Answer:
x=5
Explanation:
The angles of a triangle add up to 180 degrees
91 + 10x-4 + 8x+3 = 180
Combine like terms
18x +90 = 180
Subtract 90 from each side
18x +90-90= 180-90
18x = 90
Divide each side by 18
18x/18 = 90/18
x = 5
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