-12a+3(2a+1)=-6a

Answer 1

-12a+3(2a+1)=-6a

-12a + 6a + 3 = -6a

3 = -6a + 12a - 6a

3 = 12a

3/12 = 1/4 = a

Answer 2

-12a + 6a + 3 = -6a
-12a + 6a + 6a = -3
0 = -3 ???

This equation has no solution.

Answer 3

Thanks, Reiny. You are right. I'm wrong.