Answer:
x = 16
Explanation:
m∠EBA = m∠CBF = 40 - x
m∠DBE + m∠EBA = 90°
so (6x - 30) + (40 - x) = 90
6x - 30 + 40 - x = 90
5x + 10 = 90
5x = 90 - 10 = 80
so
x = 80/5 = 16
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