1) 486 : (5 х + 2) = 18;
5 х + 2 = 486 : 18;
5 х + 2 = 27;
5 х = 27 - 2;
5 х = 25;
х = 25 : 5;
х = 5.
2) 5 (14 + b) + 6 b = 158;
70 + 5 b + 6 b = 158;
5 b + 6 b = 158 - 70;
11 b = 88;
b = 88 : 11;
b = 8.
1) 486 : (5 х + 2) = 18;
5 х + 2 = 486 : 18;
5 х + 2 = 27;
5 х = 27 - 2;
5 х = 25;
х = 25 : 5;
х = 5.
2) 5 (14 + b) + 6 b = 158;
70 + 5 b + 6 b = 158;
5 b + 6 b = 158 - 70;
11 b = 88;
b = 88 : 11;
b = 8.