Answer:
-12e-x + 8 = 7
-12e-x = 7-8
-12e-x = -1
12e-x = 1
e-x = 1/12
ln(e-x) = ln(1/12)
x = -ln(1/12)
x = -2.485
we have
Complete the square. Remember to balance the equation by adding the same constants to each side
Rewrite as perfect squares
therefore
the answer is
3x = 15
x = 15/3
x = 5