nilai n dari 3 × (4+5) = (3×4) +(n +5)

3 x (4 + 5) = (3 x 4) + (3 x 5)
                  = (3 x 4) + (n x 5)
maka n = 5

3 × 9 = 12 + (n+5)
27 = 12 + (n+5)
27 - 12 = n + 5
15 = n + 5
15 - 5 = n
10 = n

kalau soalnya spti yg d gambar, maka n = 3