<PRE><B>Question 201714</B>
find angle A if it supplements angle B which is equal to 70-x
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A + B = 180
A + (70-x) = 180
A - x = 110
A = x + 110
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x can be any value (if you allow negative angles).
If, eg, x = 10, then 
A = 120, B = 60
if x = 15,
A = 125, B = 55

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