ravenl1001
20.11.2020 •
Mathematics
1. - 2а - 9 = 6a + 15
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Ответ:
a=-3
Step-by-step explanation:
-2a-6a=15+9
-8a=24
a=-3
Ответ:
-16.9 or -17
Step-by-step explanation:
10 + 5 + 2x - 13 + x - 4 =180
11 -10x = 180
-11 -11
-10x = 169
169/-10