а) 8y + 30 = 8 (y + 3) - 33
8y + 30 = 8y + 24 - 33
8y - 8y = 24 - 33 - 30
0y = -39
нет решений
б) 12a - (5a + 25) = -24
12a - 5a - 25 = -24
12a - 5a = 25 - 24
7a = 1
a = 1/7
в) 3x - 16 = 26 - 3 (4 + 9x)
3x - 16 = 26 - 12 - 27x
3x + 27x = 26 - 12 +16
30x = 30
x = 1
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Answers & Comments
а) 8y + 30 = 8 (y + 3) - 33
8y + 30 = 8y + 24 - 33
8y - 8y = 24 - 33 - 30
0y = -39
нет решений
б) 12a - (5a + 25) = -24
12a - 5a - 25 = -24
12a - 5a = 25 - 24
7a = 1
a = 1/7
в) 3x - 16 = 26 - 3 (4 + 9x)
3x - 16 = 26 - 12 - 27x
3x + 27x = 26 - 12 +16
30x = 30
x = 1