3a + 15 = 4a
Subtract 3a from both sides
15 = a
So a is 15.
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depends what 'a' =
If a + b = 6, what is the value of 3a + 3b?
Subtract 6 from each side: 3a = 9Divide each side by 3: a = 3Job done.
a + a + a - 2a = 3a - 2a = a
a = 3