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If [[x+3,z+4,2y-7],[-6,a-1,0],[b-3,-21,0...

If `[[x+3,z+4,2y-7],[-6,a-1,0],[b-3,-21,0]]=[[0,6,3y-2],[-6,-3,2c+2],[2b+4,-21,0]]`

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As given matrices are equal,
`:. x+3 = 0=> x =-3`
`=>z+4 = 6=> z = 2`
`=>2y-7 = 3y-2 => y = -7+2 =>y = -5`
`a-1 = -3=> a = -2`
`0= 2c+2 => 2c = -2=> c = -1`
`b-3 = 2b+4 => b = -3-4 =>b = -7`
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