The next step is to combine like terms and get the knowns on one side and the unknowns on the other.
Subtract 6a from both sides of the equation.
9a - 6a = 6a - 6a + 24
3a = 24
Divide both sides by 3 to find the value of a.
3a/3 = 24/3
a = 8
Okay, when I checked my answer, how come I got 72? when I put 8 As A into the equation.
That's what the original problem states: 72 = 72
9(8) = 6(8 + 4)
72 = 72
So I could have two answers... ? 8 and 72?
You only need to find what a represents. As we found, in this problem a = 8.
You proved it by substituting 8 for a in the original problem.
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