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7x- wiek pani
2x+20=x+7x
-6x=-20
x=4
7*4= 28
Nie jestem na 100% pewna, ale powinno być dobrze XD
y-wiek córki
7y=x
2(y+20)=x+20
x=7y
2y+40=7y+20
x=7y
-5y=-20/:(-5)
x=7y
y=4
x=7•4
y=4
x=28
y=4
odp:
pani ma 28 lat a córka 4