A+B=45 A+C=61 then A+B+C=?
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b=45-a
c=61-a
a+45-a+61-a=-a+106
-a=-106
a=106
b=-61
c=-45
a+b+c=0
c=61-a
a+45-a+61-a=-a+106
-a=-106
a=106
b=-61
c=-45
a+b+c=0
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