Question

help me pls

Answer 1

`#3107.101107`

`a)`

`12 - 6x = 0`

`=> 6x = 12`

`=> x = 12 \div 6`

`=> x = 2`

Vậy, `x = 2`

`b)`

`2x + x + 120 = 0`

`=> 3x = -120`

`=> x = -120 \div 3`

`=> x = -40`

Vậy, `x = -40`

`c)`

`x - 5 = 3 - x`

`=> x + x = 3 + 5`

`=> 2x = 8`

`=> x = 8/2 = 4`

Vậy, `x = 4`

`d)`

`7 - 3x = 9 - x`

`=> -3x + x = 9 - 7`

`=> -2x = 2`

`=> x = -1`

Vậy, `x = -1`

`e)`

\(-\dfrac{5}{9}x+1=\dfrac{2}{3}x-10\)

`=> -5/9x - 2/3x = -10 - 1`

`=> -11/9x = -11`

`=> x = -11 \div -11/9`

`=> x = 9`

Vậy, `x = 9`

`f)`

\(2\left(x+1\right)=3+2x\)

`=> 2x + 2 - 2x = 3`

`=> 2x - 2x = 3 - 2`

`=> 0 = 1` (vô lý)

Vậy, `x \in`\(\varnothing\).