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1. 2x-6y+2xy-2xy+3x = 5x-6y
itukan oprasi perkalian, kmu bisa buka kurungnya dg cara:
x.2x + x.3y + -y.2x + -y.3y=
2x^2 +3xy -2xy -3y^2 = 2x^2+ xy -3y^2