efectuatii. Va rogg!!

a)
(-5+10)-(-(3+2)+(-7)-(-14+5)
+5 -(-(-1)-7-(-9)
5-(1-7+9)
5-(-6+9)
5-3
=2
b)
5-(17-(-2+5)-(-7+15)-(4-11)
5-(17-(+3)-(+8)-(-7)
5-(17-3-8+7)
5-(15--8+7)
5-(7+7)
5-14
=-9