(150-20)/х=65
150-20=65х
130=65х
х=2
(х+4)*7=350
7х+28=350
7х=350-28
х=322/7
х=46
(300-х)*5=210
1500-5х=210
-5х=210-1500
х=258
(150-20)/х=65
150-20=65х
130=65х
х=2
(х+4)*7=350
7х+28=350
7х=350-28
х=322/7
х=46
(300-х)*5=210
1500-5х=210
-5х=210-1500
х=258