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y - wiek córki
x=7y
x+20=2(y+20)
x=7y
x+20=2y+40
7y+20=2y+40
7y-2y=40-20
5y=20
y=4
x=7*4
x=28
p = corka
7 c = m
2 c + 20 = m
7c = 2c +20
7c - 2c = 20
5c = 20 / 5
c = 4
m = 7c
m = 7 *4
m = 28
córka ma 4 lata, a mama 28