1) 3x - 7 = 16 - 2x
1. 3x + 2x - 7 = 16
2. 3x + 2x = 16 + 7
3. 5x = 16 + 7
4. 5x = 23
5. × = 5 2/3
2) 3x + 2x - 7 = 16
1. 3x + 2x - 7 = 16 + 7
2. 5x = 16 + 7
3. 5× = 23
4. x = 5 2/3
3) 7 - 2x = 1/5 + 35
1. 35 - 10x = x + 175
2. - 10x - x = 175 - 35
3. - 11x = 175 - 35
4. - 11x = 140
5. x = - 140/11
а)3х-7=16-2х. б)3х+2х-7=16 в)7-2х=1/5х+35
3х+2х=16+7. 5х=16+7. -2/1х-1/5х=35-7
5х=23. 5х=23. -10/5х-1/5х=28
х=23:5. х=23:5 -11/5х=28
х=4,6. х=4,6 -2,2х=28
х=28:(-2,2)
х=12,72
