1)3x-4=12+x
3x-x=12+4
2x=16 |:2
x= 8
2)5x-6=12-3x
5x+3x=12+6
8x=18 |:8
x=2,25
3)4(5x-6)=2(x-7)-x
20x-24= 2x+14-x
20x-2x+x=14+24
19x=38 |:19
x=2
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1)3x-4=12+x
3x-x=12+4
2x=16 |:2
x= 8
2)5x-6=12-3x
5x+3x=12+6
8x=18 |:8
x=2,25
3)4(5x-6)=2(x-7)-x
20x-24= 2x+14-x
20x-2x+x=14+24
19x=38 |:19
x=2