Question 268603
a + b + c = 69
b = a - 8
c = 5a
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by substitution, we get
a + a - 8 + 5a = 69
combine like terms to get
7a - 8 = 69
add 8 to get
 7a = 77
divide to get
 a = 11
b = 3
c = 55