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OpenStudy (anonymous):
if a-b=4 then (a-5)-(b+4)=
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OpenStudy (anonymous):
\[(a - 5) - (b+4) \implies a - 5 - b - 4 \implies (a -b) - 9\]
OpenStudy (anonymous):
thank you very much :)!
OpenStudy (anonymous):
Substitute the value of (a - b) there...
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