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QUADRATIC EQUATIONS:
2. (s+9)(s-6)=0
3. (9x-4)(4x+4)=0
4. T(7t+5)=0
5. (c-2)(c-2)=0
6. S^2+13s+40=0
7. X^2-22x+21=0
8. V^2=27-6v
9. Z^2+6z=-8
10. S^2-2s+1=0
11. 4a^2+21a+27=0
12. S^2=9
13. R^2=5r
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