If A-A-A=10 B-B-B=20 C-C-C=30 then A+B+C=
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Step-by-step explanation:
-3A = 10
A = -10/3
-3B = 20
B = -20/3
-3C = 30
C = -10
A + B + C = -10/3 + (-20/3) + (-10)
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