August 2018 2 12 Report
Sprawdź czy dane równania są równaniami tożsamościowymi:
A:2x+3x+(x-5y)=3x-2y
B:12x-(2x+1)-9(2-x)=19x
C:3(x+21)+(2x-3)=5x
D:2x+3(x+2)=6(x+1)-x



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