Question

B1:tìm x bt a)7×(x-9)-5×(6-x)=-6+11x

Answer 1

`#040911`

`a)`

\(7.(x-9)-5.(6-x)=-6+11x\)

`<=> 7x - 63 - 30 + 5x = 11x - 6`

`<=> 7x + 5x - 11x = 63 + 30 - 6`

`<=> (7 + 5 - 11)x = 87`

`<=> x = 87`

Vậy, `x = 87.`

Answer 2

=>7x-63-30+5x=11x-6

=>12x-93=11x-6

=>x=-6+93=87