নিম্নলিখিত কোনটি চতুর্ভুজ সমীকরণ নয়? 

1
2x (x + 4) - 11 = x (x - 3) + 6
2
4x (x + 4) - 11 = 5x (x - 3) + 5
3
x (x + 2) - 15 = x (x - 5) + 11
4
2x 2 + 8x - 11 = 0

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