Răspuns :
{[(7x3-5)+2x6]:4+5}x10-[(4x9)x5-60=[(16+12):4+5]x10-(36x5-60=(28:4+5)x10-(180-60)=12x10-120=120-120=0
{[(21-5)+12]÷4+5}×10-(36×5-60)=[(16+12)÷4+5]×10-120=(28÷4+5)×10-120=12×10-120=0