x : 3 * 80 = 150
х = 150 : 80 * 3
x = 1,875 * 3
x = 5,625
ответ: 5,625
300 - x * 4 = 256
x * 4 = 300 - 256
x * 4 = 44
x = 44 : 4
x = 11
ответ: 11
12 * x + 19 = 43
12 * x = 43 - 19
12 * x = 24
x = 24 : 12
x = 2
ответ: 2
x : 3 * 80 = 150
х = 150 : 80 * 3
x = 1,875 * 3
x = 5,625
ответ: 5,625
300 - x * 4 = 256
x * 4 = 300 - 256
x * 4 = 44
x = 44 : 4
x = 11
ответ: 11
12 * x + 19 = 43
12 * x = 43 - 19
12 * x = 24
x = 24 : 12
x = 2
ответ: 2