-8x - 8.
16x - 24 x = -8x
-12 + 4 = 8
The Answer to this is 10 seconds
You have to see which parallel when you find it you have to see which one is common divide the number plus the b+ x divide it and there is your answer.
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I would do it in Buhh I'm working so add all of them(16,18,20) together 6 times then add another 16 and 18 and you will get your answer.