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3 x - y = - 2

9 x - 2 y = -  1

- 6 x +  2 y = 4

9 x - 2 y = - 1

3 x = 3

x = 1

3 *1 - y = - 2

- y = - 2 - 3

- y = - 5

y =  5

S ( 1 ; 5 )

3 x - 2 y = 0

5 x -  3 y = 1

9 x - 6 y =  3

- 10 x + 6 y = - 2

- x = 1

x = - 1

5 ( - 1 ) - 3 y = 1

- 3 y = 1 + 5 = 6

y = - 2

S  ( - 1 ; - 2 )

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