Quantitative Aptitude Algebra Linear Equation in 2 Variable

જો સમીકરણ 10x + 7y + 11 = 0 અને 30x - ky - 9 = 0 નો કોઈ ઉકેલ નથી, તો k ની કિંમત શું છે?

1
-21
2
-20
3
-18
4
21

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