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C. Solve each system by elimination.

7) 8x - 6y = -20
- 16x + 7y = 30

8) 6x - 12y = 24
-x - 6y = 4

9) -8x - 10y = 24
6x + 5y = 2

10) -24 - 8x = 12y
1 + 5/9y = - 7/18 x​