We need to know the options
If N and A are defined, you multiply the value of N by the value of A.
t/3 is your expression.
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MN + NP = MP
6x - 7 + 2x + 3 = 60
8x - 4 = 60
8x = 64
x = 8
MN = 6(8) - 7 = 56 - 7 = 49
answer
x = 8
MN = 49
