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64
Step-by-step explanation:
3 (a^2 + 2ab) +4 - 5ab
=3a^2 + 6ab + 4 - 5ab
= 3a^2 + 4 + ab
a=5 b=-3
= 3× 25 + 4 - 15
= 75 - 11
= 64
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