Seudónimo
Seudónimo
02-02-2016
Mathematics
contestada
Solve 2a + 21 = 8a - 9, step by step
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Аноним
Аноним
02-02-2016
2a + 21 = 8a - 9
Combine like terms.
2a + 21 = 8a - 9
-2a -2a
21 = 6a - 9
+9 +9
30 = 6a
6a/6 = 30/6
a = 5
Answer: a = 5
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