Răspuns :

a - 8 × 5 - 8 × 5 = 8 × 5

a - 40 - 40 = 40

a - 40 = 40 + 40

a - 40 = 80

a = 80 + 40

a = 120 => numărul

X-8×5−8×5= 8×5

X−8×(5+5) = 40

X − 8×10= 40

X− 80= 40

X= 40+80= 120

X= 120