Question

teorema de tales x/9 8/12

Answer 1

X/9 = 8/12
12x =  72
  X = 72/12
  X= 6

Answer 2

$\frac{x}{9}$=$\frac{8}{12}$
12x=9x8
12x=72
x=$\frac{72}{12}$
x=6