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a-1/a+2=a-7/a-1
(a-1)(a-1)=(a+2)(a-7)
a^2-2a+1=a^2-5a-14
3a=-15
a=-5
-5+2, -5-1, -5-7
-3 , -6 , -12
rasionya adalah 2
(a-1)(a-1)=(a+2)(a-7)
a^2-2a+1=a^2-5a-14
3a=-15
a=-5
-5+2, -5-1, -5-7
-3 , -6 , -12
rasio = 2