1) 3а + 21 =
а = 21/3
a = 7
2) 4a - 4b =
4 ( a - b)
3) 5a + 2a - 9a=
-2a
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Answers & Comments
1) 3а + 21 =
а = 21/3
a = 7
2) 4a - 4b =
4 ( a - b)
3) 5a + 2a - 9a=
-2a