2a - 1 = 9
Therefore, 2a = 10
a = 10/2 = 5
Therefore, a = 5.
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2a + 9 = 4a - 19 9 + 19 = 4a - 2a 28 = 2a a = 14
2a + 1 = 3subtract 1 from both sides2a = 2divide both sides by 2a = 1
A equals 20.
The multiplicative inverse of -2a is 1/(-2a) = -1/2a
2a -3 means 2 times a minus 3 if a = 2 we have 2 x 2 - 3 = 4 - 3 = 1