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36a+6b+c-(36c+6b+a)=3.36+6x+y
36a+6b+c-36c-6b-a= 108+6x+y
35a-35c=108+6x +y
35(a - c) = 108+6x+y
↓ ↓ ↓ ↓
5 1 5 2 Por tanteo
a=5
c=1
x=5
y=2
Luego: x+y =7