part A:
M = 4(2x + 6)
  = 8x + 24
part B:
option 1) i think the x value is equal for both M and N since they have the value 8.
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option 2) Â If you meant to solve M and N with an EQUATION then here's your
8x+24 = 8x+10
24≠10  (you subtract 8x when taken to the other side)
So, the answer would be NO SOLUTION