Question 587406
x^2 - 8x = -7

intuition tells us x might be 7, but let's find out:

x^2 - 8x + 7 = 0

factors:

(x - 7)(x - 1) = 0

x = 1, 7

1 and 7 are both answers

CHECK:

1 - 8 = -7
49 - 56 = -7