1) 8(х-14)=56,
х-14=56:8,
х-14=7,
х=7+14,
х=21;
2) (46-х)·19=418,
46-х=418:19,
46-х=22,
х=46-22,
х=24;
3) 9·(143-13х)=234,
143-13х=234:9,
143-13х=26,
13х=143-26,
13х=117,
х=117:13,
х=9;
4) 17(5х-16)=238,
5х-16=238:17,
5х-16= 14,
5х=14+16,
5х=30,
х=30:5,
х=6.