([2,5,-2,|,14],[5,-6,2,|,0],[4,-1,3,|,-7])~~([10,25,-10,|,70],[10,-12,4,|,0],[0,-11,7,|,-35])
R_3=R_3-2xxR_1
R_2=R_2xx2
R_1=R_1xx5
R_2=R_2-R_1
([10,25,-10,|,70],[0,-37,14,|,-70],[0,-11,7,|,-35])~~([10,25,-10,|,70],[0,-407,154,|,-770],[0,-407,259,|,-1295])
R_2=R_2xx11
R_3=R_3xx37
R_3=R_3-R_2
([10,25,-10,|,70],[0,-407,154,|,-770],[0,0,105,|,-525])~~([10,25,-10,|,70],[0,-37,14,|,-70],[0,0,1,|,-5])
R_3=R_3xx1/105
R_2=R_2xx1/11
R_2=R_2-14xxR_3
R_1=R_1+10xxR_3
([10,25,0,|,20],[0,-37,0,|,0],[0,0,1,|,-5])
R_2=R_2xx-1/37
R_1=R_1-25xxR_2
R_1=R_1xx1/10
([1,0,0,|,2],[0,1,0,|,0],[0,0,1,|,-5])
P={(2,0,-5)}