Răspuns:
8-[6400÷16-(360-a×2)×5]÷20=3
[400-(360-ax2)x5]:20=8-3
[400-(360-ax2)x5]:20=5
[400-(360-ax2)x5]=20x5
400-(360-ax2)x5=100
(360-ax2)x5=400-100
(360-ax2)x5=300
(360-ax2)=300:5
360-ax2=60
ax2=360-60
ax2=300
a=300:2
a=150
