7*(3+c) = 33 + 5c
21 + 7c = 33 + 5cSubtract 5c from both sides:21 + 2c = 33Subtract 21 from both sides:2c = 12Divide by 2:c = 6
Проверим:7(3+6) = 33 + 567*9 = 33 + 3063 = 63
Решение верное, c=6.
7*(3+c) = 33 + 5c
21 + 7c = 33 + 5c
Subtract 5c from both sides:
21 + 2c = 33
Subtract 21 from both sides:
2c = 12
Divide by 2:
c = 6
Проверим:
7(3+6) = 33 + 56
7*9 = 33 + 30
63 = 63
Решение верное, c=6.