AX=XB
a c =X
b d
3a+b 3c+d = 7a+10c -a
2a+4b 2c+4d 7b+10d -b
b=4a+10c
2a=3b+10d
3c+d+a=0
2c+4d+b=0
2a=12a+30c+10d 0=a+3c+d
12c+4a+4d=0
a c =X
4a+10c -a-3c
a(-a-3c)-c(4a+10c}≠0
a^2+7ac+10c^2≠0
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