The problem lies with the double axes. If they are meant at multiplication, then a single axe represents sqrt20 (or 2 "square root" 5). If they are meant to be added together, then a single axe represents 10. Thus the answer could be one of the two below:
sqrt20 - (30 x 5) = -150+sqrt20
10-(30 x 5) = -140
*Also assuming normal order of operations*
-Marshal Looney DaLoon