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-x+3/5y=0|:(-1)
Metoda podstawiania:
9x-4y=98
x=3/5y
9*3/5y-4y=98
5,4y-4y=98
1,4y=98
y=70
x=3/5*70
x=42
spr:
9x-4y=98
9*42-4*70=98
378-280=98
98=98