subtract

  b(5-a)-a(b-5)

 b(5-a)-a(b-5)

=(b*5-b*a)

=5b-ab

-a(b-5)=(-a*b-a*5)=-ab+5a

5b-ab-(-ab+5a)

=5b-ab+ab-5a

=5b-5a

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 am i right 

is the answer

5b+5a

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5b+5a
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5b+5a
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