`a,3x-10=2x+13`

`3x-2x=13+10`

`x=23`

$\text{Vậy x=23}$

`b,x+12=-5-x`

`x+x=-5-12`

`2x=-17`

`x=-17/2`

$\text{Vậy x=}`-17/2`

`c,x+5=10-x`

`x+x=10-5`

`2x=5`

`x=5/2`

$\text{Vậy x=}$`5/2`

`d,6x+2^3=2x-12`

`6x+8=2x-12`

`6x-2x=-12-8`

`4x=-20`

`x=-5`

$\text{Vậy x=-5}$

`e,12-x=x+1`

`x-x=12-1`

$\text{0=11 (vô lý)}$

$\text{Vậy không có x thỏa mãn}$

`f,14+4x=3x+20`

`4x-3x=20-14`

`x=6`

$\text{Vậy x=6}$

`2(x-1)+3(x-2)=x-4`

`2x-2+3x-6-x+4=0`

`4x-4=0`

`4(x-1)=0`

`x-1=0`

`x=1`

$\text{Vậy x=1}$

`h,3.(4-x)-2.(x-1)=x+20`

`12-3x-2x-2-x-20=0`

`-10-6x=0`

`6x=-10`

`x=-5/3`

$\text{Vậy x=}$`-5/3`

`i,3(x-2)+2x=10`

`3x-6+2x=10`

`5x-6=10`

`5x=16`

`x=16/5`

$\text{Vậy x=}$`16/5`

Đáp án:

 

Giải thích các bước giải:

 a) `3x-10=2x+13`

`3x-2x=13+10`

`x=23`

b) `x+12=-5-x`

`x+x=-5-12`

`2x=-17`

`x=-\frac{17}{2}`

c) `x+5=10-x`

`x+x=10-5`

`2x=5`

`x=\frac{5}{2}`

d) `6x+2^3=2x-12`

`6x-2x=-12-8`

`4x=-20`

`x=-5`

e) `12-x=x+1`

`-x-x=-12+1`

`-2x=-11`

`x=\frac{11}{2}`

f) `14+4x=3x+20`

`4x-3x=20-14`

`x=6`

g) `2(x-1)+3(x-2)=x-4`

`2x-2+3x-6-x+4=0`

`4x=4`

`x=1`