(2379-х)/17 +202=300
(2379-х)/17=300-202
(2379-х)/17=98
2379 - х=98 * 17
2379 - х=1666
х=2379-1666
х=713
.
(2х-168)/15 - 12=58
(2х-168)/15=58+12
(2х-168)/15=60
2х-168=60*15
2х-168=900
2х=900+168
2х=1068
х=1068:2
х=534
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Verified answer
(2379-х)/17 +202=300
(2379-х)/17=300-202
(2379-х)/17=98
2379 - х=98 * 17
2379 - х=1666
х=2379-1666
х=713
.
.
(2х-168)/15 - 12=58
(2х-168)/15=58+12
(2х-168)/15=60
2х-168=60*15
2х-168=900
2х=900+168
2х=1068
х=1068:2
х=534