Question

Tìm x :x-7=-15

-4x-(-7)=-11.35

Answer 1

`#3107.101107`

`x - 7 = -15`

`\Rightarrow x = -15 + 7`

`\Rightarrow x = -8`

Vậy, `x = -8`

____

`-4x - (-7) = -11*35`

`\Rightarrow -4x + 7 = -385`

`\Rightarrow 7 - 4x = -385`

`\Rightarrow 4x = 7 - (-385)`

`\Rightarrow 4x = 392`

`\Rightarrow x = 98`

Vậy, `x = 98.`

Answer 2

1) x-7 = -15

<=> x = -15 + 7 

<=> x = -8

2) -4x - (-7) = -11.35

<=> -4x + 7 = -385

<=> -4x = -385 - 7

<=> -4x = -392

<=> x = -392 : (-4)

<=> x = 98