The true description of the figure here are:
We have x to be = 8
The value of MN is said to be 5x + 12
We have to see if 5x + 12 = MN = 52 given that X is 8
We then insert the value
5 * 8 + 12 =
40 + 12 = 52
Hence it is confirmed that the value of x is 8, and MN is 52.
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