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Primero resolvemos las multiplicaciones
(10-4)+5-(10-10)+(6+10+4)-3+(8-8)
Luego pasamos a resolver los parentesis
6+5-0+20-3+0
Eliminamos los ceros y agrupamos las sumas (6 + 5 +20), dejamos las restas (3)
6+5+20 = 31
-3 = -3
31 - 3 = 28