2х(х-3)²-х(х-6)²
2x(-6x+9)-x(+12x+36)
2-12+18x-+12-36x
-18x - упрощённое
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2х(х-3)²-х(х-6)²
2x(
-6x+9)-x(
+12x+36)
2
-12
+18x-
+12
-36x