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3 9 3
X 7 4
A)2 B)3 C) 5 D)6 E)4
6+4+5 = 5
3+9+3 = 15
x+7+4 = 15
x +11 = 15
x = 15-11
x = 4
4 2 X
0 3 6
5 4 3
A)0 B)1 C)2 D)3 E)4
4+0+5 = 9
2+3+4 = 9
x+6+3 = 9
x + 9 = 9
x = 9-9
x = 0