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9х - 9у =
5а + 5в =
3ху - 3хс =
12а - 3в =
3а - 6в =
15х + х =
5х + х3 =
x4 + х3 =
6m2 - 12my =
4a + 10b – 2 =
2x + 4x2 + 6x3 =
5x - 10x2 + 25x3 =
8y2 + 3y3 + y4 =
5c3 - 15c2 - 10c =
9y5 - 12y3 + 3y2 =
x(a + 3) - 4(a + 3) =
6(x - 3) + y(x - 3) =
7(y – 2) –x(y – 2) =
5a(a + c) – (a + c) =
6(a – c) + x(a – c) =