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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