a = 180
b = 180:2+5 = 90+5 = 95
b : c = 9 rest 5
b = 9×c+5
95 = 9×c +5
9×c = 95-5
9×c = 90
c = 90:9
c = 10
2*a-[b+(2*b-a:2):c]:3 =
= 2×180-[95+(2×95-180:2):10]:3 =
= 360 -[95+(190-90):10]:3 =
= 360-(95+100:10):3 =
= 360-(95+10):3 =
= 360 - 105:3 =
= 360 - 35 =
= 325