Penggunaan surat kuasa mutlak dalam perjanjian pengikatan jual beli terkait penyalahgunaan keadaan studi kasus putusan pengadilan tinggi nomor 464/PDT/2015/PT.SMG = The use of irrevocable power of attorney in binding sale and purchase agreement related to misuse of circumstances case study: verdict of high court number 143/PDT/2016/PT.DKI