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4x-5y=20

x-3y=10 becomes x=3y-10

plug that into the first equation:

4(3y-10)-5y=20

12y-40-5y=20

7y=60

y=60/7

If x=3y-10, then x=3(60/7)-10

x=180/7 - 70/7

x=110/7

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Q: 4x-5y equals 20 equals x-3y equals 10?
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