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= 5 per a(a-1)
7. 5x -5y + 2x +2y per (x+y)(x-y)
=7x -3y per (x+y)(x-y)
8. a kuadrat - ab+ab +b kuadrat per (a+b)(a-b)
= a kuadrat + b kuadrat per (a+b)(a-b)