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Sagot :
Answer:
9
Step-by-step explanation:
because the other side is 21 so you would do 30 - 9 = 21
Answer:
the answer is 9
Step-by-step explanation:
9+12 = 21 which is the number of the opposite side. (-6+3(9) is 21 and 30-9 is 21 so x=9
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