-21 = 9a - 15 - 3a -6 = 6a -1 = a
12
3a + 15 = 4a Subtract 3a from both sides 15 = a So a is 15.
3a-9 = 6 3a = 6+9 3a = 15 a = 15/3 a = 5 Substitute a = 5 into 4a-1. 4a-1 =4(5)-1 =20-1 =19 Therefore, the value of 4a-1 is 19.
3a = 1a = 1/3 (a third)
If: -3a-1 = -15 Then: a = 4 and 2/3
a = 14/3
-21 = 9a - 15 - 3a -6 = 6a -1 = a
12
3a + 15 = 4a Subtract 3a from both sides 15 = a So a is 15.
a = -5
3a-9 = 6 3a = 6+9 3a = 15 a = 15/3 a = 5 Substitute a = 5 into 4a-1. 4a-1 =4(5)-1 =20-1 =19 Therefore, the value of 4a-1 is 19.
3a=1divide both sides by 3a=1/3
3a = 1a = 1/3 (a third)
1
1/3=a
Answer to: 5a + 1 = a - 3a = -1