Write a matrix equation that determines the loop currents.
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For each matrix, let row 1 correspond to loop 1, row 2 correspond to loop 2, and so on. Also, enter positive values for positive voltages and negative values for negative voltages.
[[5,-2,0,0],[-2,12,-4,0],[0,-4,8,-2],[0,0,-2,8]][[I_(1)],[I_(2)],[I_(3)],[I_(4)]]=[[15],[-32],[-20],[-9]]