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1) 3x+12=30
3x=18
x= 6
comprobación
3x+12=30
3 (6)+12=30
18+12=30
30=30
2) 5x-20=30
5x=50
x=10
comprobación
5x-20=30
5 (10)-20=30
50-20=30
30=30
3) 10x+2=30-4x
10x+4x=30-2
14x=28
x=2
comprobación
10x+2=30 -4x
10 (2)+2=30-4 (2)
22=22
4) 2x+10=26
2x=16
x=8
comprobación
2x+10=26
2 (8)+10=26
26=26
5) 10x-8=80
10x=88
x=8,8
comprobación
10x-8=88
10(8,8)-8=88
88=88
6) 5x+18=40
5x=22
x=4,4
comprobación
5x+18=40
5 (4,4)+18=40
40=40
7) 2x+3=9
2x=6
x=3
comprobación
2x+3=9
2 (3)+3=9
9=9
8) 4x-2=20
4x=22
x=5,5
comprobación
4x-2=20
4 (5,5)-2=20
20=20
3x = 30-12
3x =18
x = 18/3
x = 6
5x-20=30
5x = 30
x = 30/5
x = 6
10x+2=30-4x
10x+4x = 30 -2
14x = 28
x = 28/14
x = 2
2x+10=26
2x = 26-10
2x= 16
x = 16/2
x = 8
10x-8=80
10x = 80+8
10x = 88
x = 88/10
x = 44/5
5x+18=40
5x = 40-18
5x = 22
x = 22/5
2x+3=9
2x = 9-3
2x = 6
x = 6/2
x = 3
4x-2=20
4x = 20+2
4x = 22
x = 22/4
x= 11/2