Question 64452
FACTOR 
73. X^2+5Y-XY-5X
Rewrite as:
=x^2-5x-xy+5y
=x(x-5)-y(x-5)
=(x-5)(x-y)
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75. AR+BR-A-B
=R(A+B)-(A+B)
=(A+B)(R-1)
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Cheers,
Stan H.