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y - obecny wiek matki
x+3=3 (y+3)
x+3=3y+9
x-2=4y-8
x = 3y + 6
x = 4y + 6
3y + 6 = 4y - 6
12 = y
x = 3*12 + 6 = 42
* - razy . ;D
Odp: Matka ma 42 lata, a córka 12 .
y-wiek corki
x+3=3(y+3)
y-2=(x-2)/4 /*4
x+3=3y+9
4y-8=x-2
x-3y=6
4y-x=-2+8
x=6+3y
4y-6-3y=6
x=6+3y
y=12
x=6+3*12
y=12
x=6+36
y=12
x=42
y=12
matka ma 42 lata a córka 12