(a-4b)/(3a-2b)=-2/3
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(a-4b)/(3a-2b)=-2/3(a-4b)/(3a-2b)=-2/3(a-4b)/(3a-2b)=-2/3(a-4b)/(3a-2b)=-2/3-2（3a-2b）=3（a-4b）4b-6a=3
(a-4b)/(3a-2b)=-2/3
(a-4b)/(3a-2b)=-2/3
(a-4b)/(3a-2b)=-2/3
(a-4b)/(3a-2b)=-2/3
-2（3a-2b）=3（a-4b）
4b-6a=3a-12b
16b=9a
16/9=a/b
(a-4b)/(3a-2b)=-2/3
=> -2（3a-2b）=3(a-4b)
=> 8b=3a
=> b/a=3/8