486:(5х+2)=12
5х+2=486:12
5х+2=40.5
5х=40.5-2
5х=38.5
х=38.5:5
х=7.7
Ответ: 7.7
28*(х+5)=224
х+5=224:28
х+5=8
х=8-5
х=3
Ответ: 3
(16m+5m):18=7
21m:18=7
21m=7*18
21m=126
m=126:21
m=6
Ответ: 6
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Answers & Comments
486:(5х+2)=12
5х+2=486:12
5х+2=40.5
5х=40.5-2
5х=38.5
х=38.5:5
х=7.7
Ответ: 7.7
28*(х+5)=224
х+5=224:28
х+5=8
х=8-5
х=3
Ответ: 3
(16m+5m):18=7
21m:18=7
21m=7*18
21m=126
m=126:21
m=6
Ответ: 6