If the line \( (3 x-8 y+5)+a(5 x-3 y+10)=0 \) is parallel to \( X \)-axis, then \( a \) is (a) \...

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If the line \( (3 x-8 y+5)+a(5 x-3 y+10)=0 \) is parallel to \( X \)-axis, then \( a \) is
(a) \( -\frac{8}{3} \)
(b) \( -\frac{3}{5} \)
(c) \( -2 \)
(d) \( -\frac{1}{2} \)
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