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2.a pangkat2 + ax + Ay +xy= a(a+x)+ y (a+x)
3.ab-ac-bx+ xpangkat 2 =a(b-c) -x(b+x)
4.(a+b)x+(a+b)y=(a+b)(....+.....
5.a(a+b)-c(a+b)=(a+b) (....-....)
6.(c-a)x - y(c-a)=(c-a)(.....-.....)