SOLUTION: Let a + b + c + d = 29 a + c = 13 and a + b + d = 19 what is the value of a ?

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Question 243415: Let a + b + c + d = 29 a + c = 13 and a + b + d = 19 what is the value of a ?
Answer by Alan3354(69443) About Me  (Show Source):
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Let a + b + c + d = 29 a + c = 13 and a + b + d = 19 what is the value of a ?
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c = 13-a
b+d = 19-a
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a + (13-a) + (19-a) = 29
-a + 32 = 29
-a = -3
a = 3