How do I divide two 3x3 matrices in java?

public static void three_tri(int x1, int y1, int z1, int d1, int x2, int y2, int z2, int d2, int x3, int y3, int z3, int d3, int x4, int y4, int z4, int d4) { int x_n11 = (d1^2-d2^2) - (x1^2-x2^2) - (y1^2-y2^2) - (z1^2-z2^2); int x_n21 = (d1^2-d3^2) - (x1^2-x3^2) - (y1^2-y3^2) - (z1^2-z3^2); int x_n31 = (d1^2-d4^2) - (x1^2-x4^2) - (y1^2-y4^2) - (z1^2-z4^2); int x_n12 = 2*(y2-y1); int x_n22 = 2*(y3-y1); int x_n32 = 2*(y4-y1); int x_n13 = 2*(z2-z1); int x_n23 = 2*(z3-z1); int x_n33 = 2*(z4-z1); int d11 = 2*(x2-x1); int d21 = 2*(x3-x1); int d31 = 2*(x4-x1); int d12 = 2*(y2-y1); int d22 = 2*(y3-y1); int d32 = 2*(y4-y1); int d13 = 2*(z2-z1); int d23 = 2*(z3-z1); int d33 = 2*(z4-z1); int[][] d = new int[3][3]; d[0][0] = d11; d[0][1] = d12; d[0][2] = d13; d[1][0] = d21; d[1][1] = d22; d[1][2] = d23; d[2][0] = d31; d[2][1] = d32; d[2][2] = d33; int[][] x_n = new int[3][3]; x_n[0][0] = x_n11; x_n[0][1] = x_n12; x_n[0][2] = x_n13; x_n[1][0] = x_n21; x_n[1][1] = x_n22; x_n[1][2] = x_n23; x_n[2][0] = x_n31; x_n[2][1] = x_n32; x_n[2][2] = x_n33;