1)28х -15у +12х=.
2)17а^3-b^2-8-9a^3 -b^2= .
3)0,2n^3m - n^3 m+nm^4=.
4) 16a^4 - 15b^3 - 15b^2 +a^4=
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40х-15у=
-15у=-40х(/(-1)(разделим на -1)
15у=40х
у=40х/15
Так,вроде)