Answer:
16
Explanation:
Sum of all angles of triangle = 180
30 + 90 + 4x - 4 = 180
30 +90 - 4 + 4x = 180
116 + 4x = 180
Subtract 116 form both sides
4x = 180 - 116
4x = 64
Divide both sides by 4
x = 64/4
x = 16
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