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2. a=7k
b=9k
c=11k
d=15k
Remplazo en la expresión
7k+9k+11k=36
27k=36
k=4/3
∴ c= 15(4/3) ⇒ 20
3. a=5k
b=8k
c=5k
Remplazo en la expresión
3(5k)-5(8k)+2(5k)=245
15k-40k+10k=245
k= - 49/3
∴a+b+c = 18(-49/3) ⇒ - 294