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3a + 15 = 4a Subtract 3a from both sides 15 = a So a is 15.
-21 = 9a - 15 - 3a -6 = 6a -1 = a
- 3a - 1 = - 15 add 1 to each side - 3a = - 14 divide each side by - 3 ( dividing a negative by a negative leaves a positive #) a = 14/3 check - 3(14/3) - 1 = - 15 - 15 = - 15
depends what 'a' =
Subtract 6 from each side: 3a = 9Divide each side by 3: a = 3Job done.