Question

-7x-28=-77 ; - 4x-16=40​

Answer 1

Răspuns:

Explicație pas cu pas:

- 7 x - 28 = - 77

- 7 x = - 77 + 28

- 7 x = - 49

x = ( - 49 ) : ( - 7)

x = 7

Verific:   - 7 × 7 - 28 = - 49 - 28 = - 77

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- 4 x - 16 = 40

- 4 x = 40 + 16

- 4 x = 56

x = 56 : ( - 4 )

x = - 14

V:  - 4 × ( - 14 ) - 16 = + 56 - 16 = 40