решите пж
(x-1):3=(20-2x):3
15*(e+2):7=6*(2e+7):7
5*(c+3):6=8*(10-c):6
(x-1):3=(20-2x):3
15*(e+2):7=6*(2e+7):7
5*(c+3):6=8*(10-c):6
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Answers & Comments
(х-1)*3=(20-2х)*3
х-1=20-2х
х+2х=20+1
3х=21
х=7