Wyznacz x z równania: 5x+10y=20
5x=20-10y/:5
x=4-2y
5x+10y=20 //-10y
5x=20-10y // /5
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5x=20-10y/:5
x=4-2y
5x+10y=20 //-10y
5x=20-10y // /5
x=4-2y