Ответ:
-10 2/4+х=-7 2/4 х
-42/4+х=-30/4х
-21/2+х=-15/2х
-21+2х=-15х
2х+15х=21
17х=21
х=21/17
х=1 4/17
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Ответ:
-10 2/4+х=-7 2/4 х
-42/4+х=-30/4х
-21/2+х=-15/2х
-21+2х=-15х
2х+15х=21
17х=21
х=21/17
х=1 4/17