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Flamme12

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f (x) = - 7 x + 3

- 7 x + 3 = -  4

- 7 x = - 4 - 3

- 7 x = - 7

x = - 1

f ( - 1 ) = - 4

- 7 x + 3 = 17

- 7 x = 17 - 3

- 7 x = 14

x = - 2

f ( - 2 ) =  17

- 7 x + 3 = - 18

- 7 x = - 18 - 3

- 7 x = - 21

x = 3

f ( 3 ) = - 18

-  7 x + 3 = 20

- 7 x = 20 - 3

- 7 x =  17

x = - 17/7

f ( - 17/7 ) = 20

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