Question 1087357
{{{(matrix(3,4,
-15,-2,1,-18,
20,1,0,36,
-10,-2,1,-8))}}}
Replace {{{R[2]}}} with {{{2R[3]+R[2]}}}
{{{(matrix(3,4,
-15,-2,1,-18,
0,-3,2,20,
-10,-2,1,-8))}}}
Replace {{{R[3]}}} with {{{2R[1]-3R[3]}}}
{{{(matrix(3,4,
-15,-2,1,-18,
0,-3,2,20,
0,0,1,4))}}}
Replace {{{R[2]}}} with {{{R[2]-2R[3]}}},
{{{(matrix(3,4,
-15,-2,1,-18,
0,-3,0,12,
0,0,1,4))}}}
Replace {{{R[1]}}} with {{{R[1]-R[3]}}},
{{{(matrix(3,4,
-15,-2,0,-22,
0,-3,0,12,
0,0,1,4))}}}
Replace {{{R[1] with {{{3R[1]-2R[2]}}},
{{{(matrix(3,4,
-45,0,0,-90,
0,-3,0,12,
0,0,1,4))}}}
Divide {{{R[1]}}} by {{{(-1/45)}}}, {{{R[2]}}} by {{{(-1/3)}}},
{{{(matrix(3,4,
1,0,0,2,
0,1,0,-4,
0,0,1,4))}}}