7,14х+17,86х = 38
25х=38
х=38:25
х=1,52
Проверка
7,14* 1,52+17,86*1,52 = 38
10,8528+27,1472=38
38=38
2)199,29х-119,29х=72
80х=72
х=72:80
х=0,9
199,29* 0,9-119,29*0,9=72
179,361-107,361=72
72=72
