800-(y*8-20)=100 помогите плиз
Y*8-20=800-100 Y*8-20=700 Y*8=700+20 Y*8=720 Y=720:8 Y=90
800 - ( 8Y - 20) = 100 800 - 8Y + 20 = 100 820 - 100 = 8Y 720 = 8Y Y = 90
cпс