x = [1 2 4; 3 4 5; 5 6 7]
then y should be the sum of the diagonals of the matrix
y = 1 + 4 + 7 = 12
dooh ... the solution is in test suite
yeah, but it's a long one
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05 - Vector Equations 3
06 - Matrix Equations 2
Replace May with April
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