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hmm what is your math book answer?

That is the math book answer

hmm and what is your answer?

ok.. i also have got a different answer but not sure.. so can you put steps how you solve it?

and it's matrix right?

it looks like its just a typing error, try asking or calling your teacher

81x - 21x = 24
60x = 24
x = 24/60 = 2/5

2/5 = 4/10 = 0.4
not 2.5

60x=24
x=2.5 ?? don't you think it is x= 24/60 = 2/5

The book's solution would be correct if the first line of the matrix were
0 7 2 (rather than 0 7 9)