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1. Operaciones entre paréntesis
2. Las divisiones
3. Las multiplicaciones
4. Sumas y restas
ENTONCES
(21-7):2-4+(10+5):(-5)+12:(-8+2)=
(14):2-4+(15):(-5)+12:(-6)=
7-4+(-3)+(-2)=
7-4-3-2=
R= -2
Espero que te ayude