4(9+7х)+21=393
36 + 28х + 21 = 393
28х = 393 - 21 - 36
28х = 336
х = 12
486:(5х+2)=18
5х + 2 = 486:18
5х + 2 = 27
5х = 25
х = 5
5(14+b)+6b=158
70 + 5b + 6b = 158
11b = 88
b = 8
4(9+7х)+21=393
36 + 28х + 21 = 393
28х = 393 - 21 - 36
28х = 336
х = 12
486:(5х+2)=18
5х + 2 = 486:18
5х + 2 = 27
5х = 25
х = 5
5(14+b)+6b=158
70 + 5b + 6b = 158
11b = 88
b = 8