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a/b = 5/4
a = 5/4 b
(a+2) : (b+2) = 7 : 9
(a+2)/(b+2) = 7/9
7.(a+2) = 9.(b+2)
7a + 14 = 9b + 18
7a = 9b + 4
7.(5/4b) = 9b + 4
35/4 b = 9b + 4
kali 4
35b = 36b + 16
b = -16
a = 5/4 b
= 5/4 x -16
= -20
a+b
-20 - 16
-36