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TR-MO-R1 2019 Problem 3

    kk bir sabit gerçel sayı olmak üzere,

    x+y−2z=13x+4z=2kx+2y=3\begin{aligned} x + y - 2z &= 1 \\ 3x + 4z &= 2 \\ kx + 2y &= 3 \end{aligned}

    denklem sistemini sağlayan (x,y,z)(x, y, z) gerçel sayı üçlüsü bulunmuyorsa, kk kaçtır?

    a) 1 b) 3 c) 5 d) 7 e) 9

    Official text Turkish Mathematical Olympiad, first round 2019 official paper, page 2. Quoted with source.

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