х * 8 = 25 + 15
8х=40
х=40:8
(43 - 39)* x = 24
4х=24
х=24:4
12 : x+ 10 = 13
12:х+10=13. х≠0
12/х+10=13
12/х=13-10
12/х=3
12=3х
3х=12
х=4. х≠0
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х * 8 = 25 + 15
8х=40
х=40:8
х=5
(43 - 39)* x = 24
4х=24
х=24:4
х=6
12 : x+ 10 = 13
12:х+10=13. х≠0
12/х+10=13
12/х=13-10
12/х=3
12=3х
3х=12
х=4. х≠0
х=4