Question

Twelve subtracted from seven times a number is equal to the square of a number

Answer 1

Let's call the number "n."

5)  So, all together it's:  "7n - 12 = n^2

n^2 - 7n + 12=0

n^2 -3n -4n +12=0

n(n-3)-4(n-3)

(n-4)(n-3)

n=4,3