Question

Ecuaciones
2x+21=3x-6

12(x-2)=1-x

x+5x-4=18-2x

6(7-x)=8(6-x)

4(2x+3)-2x4x+20

4(x-6)=12-(x-3)

3(1-2x)+12=10-2(x-3)

-2(x+3)-4=18+4x

6x-2(x-3)=12

(x+3).3=(13-x).4+3

Answer 1

2x+21=3x-6
21+6=3x-2x
27=x


12(x-2)=1-x
12x-24=1-x
12x+x=1+24
13x=25
x=25/13


x+5x-4=18-2x
x+5x+2x=18+4
8x=22
x=22/8=11/4


6(7-x)=8(6-x)
42-6x=48-8x
8x-6x=48-42
2x=6
x=6/2=3

4(2x+3)-2x=4x+20
8x+12-2x=4x+20
8x-2x-4x=20-12
2x=8
x=8/2=4

4(x-6)=12-(x-3)
4x-24=12-x-3
4x+x=12-3+24
5x=33
x=33/5


3(1-2x)+12=10-2(x-3)
3-6x+12=10-2x+6
-6x+2x=10+6-12-3
-2x=1
x=-1/2


-2(x+3)-4=18+4x
-2x-6-4=18+4x
-2x-4x=18+10
-6x=28
x=-28/6=-14/3

6x-2(x-3)=12
6x-2x+6=12
4x=12-6
4x=6
x=6/4=3/2

(x+3).3=(13-x).4+3
3x+9=52-4x+3
3x+4x=52+3-9
7x=46
x=46/7