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x²-x-4=x²-4-x
-4=-4
tożsamościowe
2x-5(x-2)=3(5-x)
2x-5x+10=15-3x
-3x+10=15-3x
10=15
sprzeczne
x² - 1x - 4 = x² + 2x - 2x - 4 - x
x² - x - x² - 2x + 2x + x = -4 + 4
0 = 0 równanie sprzeczne
2x-5(x-2)=3(5-x)
2x - 5x + 10 = 15 - 3x
2x - 5x + 3x = 15 - 10
0x = 5
x²-x-4=x²-2²-x
-x+x=-4+4
0=0
2x-5x+10=15-3x
-3x+3x=-10+15
0≠5