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सिद्ध कीजिए कि रेखाएँ (x+1)/(2)=(y+1)/(3...

सिद्ध कीजिए कि रेखाएँ `(x+1)/(2)=(y+1)/(3)=(z+1)/(4)` और `x+2y+3z-14=0, 3x+4y+5z-26=0` समतलीय हैं और उनके प्रतिच्छेद-बिंदु के नियामक ज्ञात कीजिए ।

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