x - 5b = 5
4x - 10b = 38
x = 5 + 5b
Сделаем замену:
4*(5 + 5b) - 10b = 38
20 + 20b - 10b = 38
10b = 38 - 20
10b = 18
b = 1.8
x = 5 + 5*1.8
x = 14
x - 5b = 5
4x - 10b = 38
x = 5 + 5b
4x - 10b = 38
Сделаем замену:
x = 5 + 5b
4*(5 + 5b) - 10b = 38
x = 5 + 5b
20 + 20b - 10b = 38
x = 5 + 5b
10b = 38 - 20
x = 5 + 5b
10b = 18
x = 5 + 5b
b = 1.8
x = 5 + 5*1.8
b = 1.8
x = 14
b = 1.8
x = 14
b = 1.8