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Answer:
1)She Made First Mistake in 12(5+2y) And Second She Did"nt Change the Sign i.e 4y-(5y-9y)
Step-by-step explanation:
2)Solution=12(5+2y)=4y-(5y-9y)
=60+24y=4y-5y+9y
=60=8y-24y
=y=-60/16
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