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Answer:
10
Step-by-step explanation:
The equation of a triangle is that all the angles add up to 180°.
So,
180 = 90 + 27 + (6x+3)
180 = 117 + (6x+3)
( Subtract 117)
63 = (6x+3)
( Subtract 3)
60 = 6x
( Divide by 6)
10 = x