Question

I've tried working this out, but it isn't working out for me for any of these.

Answer 1

None of these equal each other when plugged in. What am I doing wrong?

Answer 2

3x+15=6x-9
15+9 = 6x - 3x
21 = 3x
x = 21/3 = 7

Answer 3

What are you saying the answer is?

Answer 4

sorry I didn't see the bottom, but it's the last one 8.

Answer 5

try subbing it in.

Answer 6

Oh, ok. I was making a slight calculation error. I got what I was doing wrong. Stupid mistakes. Thanks!

Answer 7

no problem :)