1)4,1х-2,1х=2х
4,1-2х=2,1
2,1х=2,1
х=1
2)-7у-21=6у+57
-7-6=57+21
-13=78
у=-6
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Answers & Comments
1)4,1х-2,1х=2х
4,1-2х=2,1
2,1х=2,1
х=1
2)-7у-21=6у+57
-7-6=57+21
-13=78
у=-6