Решить уравнения 9(143-13х)=234; 17(5х-16)=238;

9*(143-13*х)=234.143-13х=234:9143-13х=2613х=143-2613х=117х=117:13х=9

9(143-13х)=234;
9*143 - 9*13х = 234
1287 - 117х = 234
117х = 1287 - 234 = 1053 
х = 1053 : 117 = 9

17(5х-16)=238;
17 * 5х - 17*16 = 238
85х - 272 = 238
85х = 238 + 272 = 510
х = 510 : 85 = 6