If \( (a+b, a-b) \) is the solution of the equations \( 3 x+2 y=20 \) and \( 4 x-5 y=42 \), then...

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If \( (a+b, a-b) \) is the solution of the equations \( 3 x+2 y=20 \) and \( 4 x-5 y=42 \), then find the value of \( b \).
(a) 8
(b) \( -2 \)
(c) \( -4 \)
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