Akibat hukum pembatalan perkawinan poligami oleh isteri pertama terhadap pembagian harta bersama dan hak-hak isteri kedua : studi kasus putusan pengadilan tinggi agama Pekanbaru nomor 42/pdt.g/2017/pta.pbr = Legal consequences resulted by the annulment of polygamous marriage by the first wife towards the division of matrimonial property and the second wife's rights : case study on the verdict of Pekanbaru religious high court no. 42/pdt.g/2017/ pta.pbr