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2. x=-12-5=-17
3. x=7-16=-9
4. x=10+9=19
5. x=18+14=32
6. y=-18+27=9
7. 3y-2y=-18 y=-18
8. 5y-4y=10 y=10
9. 7y-6y=-12 y=-12
10. 9y-8y=15 y=15