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a+b=8 , b+c=10, c+a=12
a=8-b, c=10-b, 10-b+8-b=12; 18–2b=12; 6=2b; b=3
a=8–3=5, c-5=12; c=7, 3+7=10
a+b+c= 5+3+7=15
answer 15
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