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7. AB = 8 + X
3/1,8 = 10/X
3X = 18
X = 6
AB = 8 +6 = 14

8. 4/8 =7/8+x
32+4x = 56
4x = 56-32
4x =24
x = 6

y/6 = 1
y = 6

x+y = 12