Rank filler

Here we have a homogeneous linear system of 3 equations on 2 variables, of which some coefficients are missing. Please complete the boxes in such a way that the system has a non-zero solution.
+6 x 1 -3 x 2 = 0
-2 x 1 + x 2 = 0
x 1 - x 2 = 0
This exercise has at least one integer solution, but it is not necessarily unique. And the analyser of solutions does not recognize approximative solutions (type 1/3 instead of 0.333333)!

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