please anyone solve this
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R1=r1+r2+r3
2a+3b 2a+3b . 2a+3b
a+2b . a a+b
a+b a+2b a
taking 2a+3b common
1 1 1
a+2b a a+b (2a+3b)
a+b a+2b a
c1=c1-c3
c2=c2-c3
0 0 1
b -b a+b (2a+3b)
a a+b a
now expanding the determinant
1(b^2+ab+ab)(2a+3b)
(b^2+2ab)(2a+3b)
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