Answer:
x = 18
Step-by-step explanation:
I the given triangle, it appears that M and N are the midpoints of the segments BG and BD respectively. If it so, then let us solve it.
By mid segment theorem:
2MN = GD
2(6x - 51) = 114
12x - 102 = 114
12x = 114 + 102
12x = 216
x = 216/12
x = 18
The difference will be

.
Remember that parentheses are needed for the second polynomial because the negative is distributed to all of its terms.
Ln x=5-2
ln x=3
ln x is base e log x
so,
x=e^(3)
x=20.0855369232