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2. y=7x-1
3. y=7x+2
4. y=7x-2
5. y=7x+3
6. y=7x-3
7. y=7x+4
8. y=7x-4
9. y=7x+5
10. y=7x-5
11. y=7x+6
12. y=7x-6