Start with the inner most brackets and work your way out.
10+4−(3−(1+2−(4−9)))=14−(3−(3−(−5)))=14−(3−(3−−5))=14−(3−(8))=14−(3−8)=14−−5=14+5=19
why wont you just check it in the calculater? its 19
