Help! solve word problem

When the ladder is fully extended, the ladder is 35 feet in length. The extension is 7 feet shorter than the base, how long is each part of the ladder?
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1 Answer

ladder leng=x+y=35

y=x-7

so x+(x-7)=35

2x-7=35

2x=42

x=21

y=21-7=14
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