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Answer:
All real numbers
Step-by-step explanation:
4 ( a + 3 ) = 12 + 4a
First, distibute on the left:
4 ( a + 3 )
( 4 x a ) + ( 4 x 3 )
4a + 12
4a + 12 = 12 + 4a
Subtract 12 from each side:
4a = 4a
Subtract 4a from each side:
0 = 0