1 a-2a-{3a-(4a-5)} i need help plz and on this one to

13(5-t)-(5-t)-12(5-t)

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1 a-2a-{3a-(4a-5)} i need help plz and on this one to

13(5-t)-(5-t)-12(5-t)

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13(5-t)-(5-t)-12(5-t)

=65-13t-5-t-60+12t

=-13t-t+12t+65-5-60

=-2t

a-2a-{3a-(4a-5)}

=a-2a-3a-4a-5

=-8a-5