Решите уравнение: 1) 17 x - 8 = 20 x + 7;, 2) 0,6 (x - 2) + 4,6 = 0,4 (7 + x) ;, 3) (х - 1) / (х - 5) = 2/9;, 4) 4 - 6 (х+2) = 3 - 5 х.

17 Х-8=20 х+7

17 х-20 х=8+7

-3 х=15

х=15: (-3)

Х=-5

13 Х+10=6 х-4

13 х-6 х=-10-4

7 х=-14

Х=-14:7

Х=-2

0.6 (х-2) + 4,6=0,4 (7+х)

0.6 х-1.2+4,6=2.8+0.4 х

0.6 х-0.4 х=2.8+1.2

0.2 х=4

Х=4:0,2

Х=20

13 х+71-2=0

13 х=-71+2

13 х=-69

Х=-69:13

Х=-5.307 ...