December 2018 1 26 Report
Wykonaj dodawania i rozpisz jak liczyłeś:

a) 8x+(6y-7x-2)

b)(3x-4y+7)+(2x+4y-7)

c)9x+(-6x+2y+5)

d)(-5a-6b+1)+(-a+7b-9)
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