Question

5х+8=1; 20:х-4=16; 17-5х=2; 21+3:х=18.

Answer 1

5х+8=1
5х=1-8
5х=-7
х=-7:5
х=-1,4

20:х-4=16
20:х=16+4
20:х=20
х=20:20
х=1

17-5х=2
5х=17-2
6х=15
х=15:5
х=3

21+3:х=18
3:х=18-21
3:х=-3
х=-3:3
х=-1