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Solo tienes que tener la multiplicación de signos claros: +(+)=+, -(+)=-, +(-)=-, -(-)=+
1. -19+(-15)-16+21-(-3)+(-7)
-19-15 -16+21+3-7
R=-19
2. -15-(-17)+3-(7)
-15+17+3-7
R=-2
3. 13+4+7+(-9)+16-(-5)
24-9+16+5
R=36
4. 5+(-5)
5-5
R=0
5. 13-4+(-7)+9-16-5
2+9-16-5
R=-20
Éxitos!!