Explicación paso a paso:
.x-9=21
x= 21+9
x=30
.x+3=18
x=18-3
x=15
.x-19=4
x=4+19
x=23
. x+18=64
x=64-18
x= 46
. 4x=40
x=40/4
x=10
. 2x+3=21
2x=21-3
2x=18
x=18/2
x=9
. 3x+9=39
3x=39-9
3x=30
x=30/3
. 2x+4=6
2x=6-4
2x=2
x=2/2
x=1
. 6x-2=16
6x=16+2
6x= 18
x=18/6
x=3
. 2x-6=16
2x=16+6
2x=22
2x=22/2
x= 11
. 8x+2=6x+4
8x-6x= 4-2
2x= 2
. 6x-3 =5x+1
6x-5x= 1+3
x= 4
. 3-x=-2x-5
-x+2x= -5-3
x=-8
. 2x+3x+5=65
5x=65-5
5x=60
x=60/5
x=12
. 4x+6= -x-14
4x+x=-14-6
5x=-20
x= -20/5
x=-4
Espero haberte ayudado
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Explicación paso a paso:
.x-9=21
x= 21+9
x=30
.x+3=18
x=18-3
x=15
.x-19=4
x=4+19
x=23
. x+18=64
x=64-18
x= 46
. 4x=40
x=40/4
x=10
. 2x+3=21
2x=21-3
2x=18
x=18/2
x=9
. 3x+9=39
3x=39-9
3x=30
x=30/3
x=10
. 2x+4=6
2x=6-4
2x=2
x=2/2
x=1
. 6x-2=16
6x=16+2
6x= 18
x=18/6
x=3
. 2x-6=16
2x=16+6
2x=22
2x=22/2
x= 11
. 8x+2=6x+4
8x-6x= 4-2
2x= 2
x=2/2
x=1
. 6x-3 =5x+1
6x-5x= 1+3
x= 4
. 3-x=-2x-5
-x+2x= -5-3
x=-8
. 2x+3x+5=65
5x=65-5
5x=60
x=60/5
x=12
. 4x+6= -x-14
4x+x=-14-6
5x=-20
x= -20/5
x=-4
Espero haberte ayudado