Siostra jest starsza od brata o 7 lat. Za 3 lata będzie dwa razy starsza od brata. Ile lat ma brat?
y=x+7
y+3=2x ----------------->y+3=2x
x+7+3=2x
7+3=2x-x
10=x
x- wiek brata
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y=x+7
y+3=2x ----------------->y+3=2x
x+7+3=2x
7+3=2x-x
10=x
x- wiek brata