0
Anonymous
you have to make it into a one variable equation
21 * 21 = 7 * 7 * X
441 = 49 * X
441/49 = X
9 = X
Wiki User
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How about: 3 times -7 = -21
7x3=21
49
You can use 7 and 3 which equals to 21.
twenty-one 7 + 7 + 7 = 21 = 3 + 18