Ответ:
15a + 5a + 30 = 20a + 30
15a + 5a - 20a = 30 - 30
0 = 0
10(2a + 3) = 20a + 30
20a + 30 = 20a + 30
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Ответ:
15a + 5a + 30 = 20a + 30
15a + 5a - 20a = 30 - 30
0 = 0
15a + 5a + 30 = 20a + 30
10(2a + 3) = 20a + 30
20a + 30 = 20a + 30